In regards to Sakura's living situation, I'm more wondering why Naruto doesn't just offer her a job? I mean, shipping aside, they were freaking teammates, she's married to his "supposed" best friend! Sarada's a genin (I think? I guess it depends on whether we're talking about the anime or manga) who will also be working, and as far as I know Sasuke isn't contributing a damn thing as far as Gaiden explains. So why not go back out in the workforce? Your hubby is clearly not paying the bills (among other things). Did they ever talk about this? Oh, wait. They can't, otherwise the fans will feel their precious ships being threatened by the mere idea passion could ignite between them. But wait, hasn't it been established that Naruto never really loved her? So what's the big deal if they do see each other again. Then again, this does seem to fit in well with Naruto's new scumbag character: not giving a damn about any of his so-called "bonds."
In regards to traditionalism playing a role, well, I don't know. I get that Japan is very traditionalist and slow to change, but the thing is many mainstream manga doesn't reflect that. You've got Goku who throughout the majority of DragonBall was unemployed. Yusuke was a delinquent whose mother birthed him when she was 14, that had to have been a double shame on that character!
Oh, and Rurouni Kenshin (yes, I'm aware of what Watsuki has done. When speaking of this series, I will be praising the artwork and writing, but not the person behind it). Kaoru fell in love with a homeless man who took over the "womanly" duties for her, and at the conclusion she is the master of her own dojo. Keep in mind, at the conclusion, she's barely over 20 and is the master of a dojo in the 1800s! That HAD to have been frowned upon if it happened in real life! There are probably more and better examples, but those are the ones I'm thinking of off the top of my head.
As to how this factors into marriage, Naruto still contradicts that. I had a sociology teacher who lived in both Japan and China for a while, and in Japan love in marriage is considered unnecessary. PREFERABLE, mind you, but not necessary. A lot of times the two just get together believing they can have some sort of working relationship, have a kid, and take it from there. In Naruto, it seems more that the men have to marry the girls that fall for them, because apparently the new rule is they can never change, so you might as well settle. And Sakura let Karin have her baby's umbilical cord, so there's that...