If you're comparing NaruHina, which had 700 chapters to potentially develop, with a NON CONFIRMED pairing that had four seasons spanning under 20 episodes, then your perspective is skewed. First of all, Asami and Korra did not jump 20 years into the future, with kids, after a 15 year run where everything was pointing to Makorra. They didn't even get an 'I love you' so if that's pandering to the fanbase, that's pretty weak. There is implication, yes, but people also fail to put into perspective what the characters had gone through and how this is not as left-field and illogical as it might seem.
Asami's father just died. Unlike the other characters of Korra's "Krew", she doesn't have anyone left to lean on. Bolin has his brother, his large new-found family, Opal, by extention the Beifongs, and has a great relationship with Verrick (as seen by being 'minister' at his wedding). Mako has his brother and family, and he had a moment with Korra where he firmly said he'd stand by her. They don't need a journey with Korra to get away from it all or whatever. Asami was at a wedding and her father's death is obviously hard on her. She teared up when she mentioned him, and when she admitted to Korra, "I don't know what I'd do if I'd lost you and my father," it confirms what has never really been disputed--Asami is lonely. Her father was everything to her, he betrayed her, and just when she forgives him he was suddenly taken away from her and because of everything going on she couldn't just stop to process.
Now think--where are they going? Are they going to some sexy resort, all eyebrow waggling and sly grins? They're going to the spirit world. I think it's quite symbolic of a spiritual journey after loss and suffering. Remember that in season 3 Asami had offered to go with Korra when she was recovering. Seeing someone vulnerable and being there for them isn't a bad way to develop a deep connection. Whatever their past together, the awkwardness of Mako being between them, it's rather insignificant compared to having a friend nearly die. That, and their inclination for friendship wasn't suddenly brought on in the last season. Asami had told Mako season 1, "I like Korra," meaning that even with that boyfriend baggage she liked Korra as a person. It's not a stretch to say Korra is likeable.
Then in season 3 they continued to bond, obviously having moved on from Mako and finding his awkwardness silly as an in-joke between them. That's great development, and removes the idea that this would be a roadblock toward any greater relationship between them. Then of course, Korra's suffering and Asami's compassion probably helped forge that bond where Korra feels that she has an easier time communicating with Asami. I like this a development between them a lot more than what we got in Season 2 with love triangle nonsense, because if we're supposed to believe that the two are honestly friends we needed something deep like this and it delivered. It was relationship drama that I believe really stunted the show, but the handling of this relationship was a highlight for me.
Now back to the theme of season 4, Korra had to take a journey to recovery which, by her words in the last episode helped her become a more compassionate person even toward someone like Kuvira. Now, the tables have turned and Asami, a friend who had supported her through tough times, is having one of her own and she suggests to go on vacation. When Asami says she wanted to see the spirit world, Korra says this is perfect. Why? Because a portal is conveniently there? Sure, but also maybe because spirituality and recovery are linked in this universe. If you look at it outside of the perspective of shipping, this ending can be interpreted as hurt/comfort and compassion. It fits with the theme of season 4 and Korra's growth.
Now, supporting and forging a relationship by compassion is not bad ship material. Asami was part of Korra's group. It's not like Hinata where she was always on the outside looking in--Asami actively gave her support. Also, it's not the resolution of their potential pairing but the beginning. Unlike Makorra where the finale ended with a kiss and girlfriend/boyfriend status, Korrasami is left to develop with the seeds having been sown not in some outside source, but since season 3. It's not a picture perfect pairing but to say that it's the equivalent of NaruHina is ridiculous. The ending of Legend of Korra is eons better than what we got. Bryke ended it right by making it feel like the start of something more, rather than the definitive ending.
Korra said she still feels like there is so much more room to grow, to change, to learn. She has hope again. Likewise, the group will grow with her. What the ending told us is that it is implied that Korra and Asami's development toward each other is heading toward a potential romance and why not? What is so horribly bad about Korra and Asami's relationship that it shouldn't be a possibility? Korra may never end up with Asami. It's not like we got a TWENTY YEAR FLASH FORWARD that has set anything in stone. What people are threatened by is the mere implication of it! It's ridiculous. I would think after the horror that is Naruto's ending we'd have set our bars low that this wouldn't be something we're up in arms. We've seen terrible handling of pairings. Don't lessen the terribleness that was NaruHina by comparing it to something so tam