@Atheck - In respose to your post, do you mean a positive or negative impact? Because I feel it's the former.
While this chapter has demonstrated Sakura's healing prowess now rivals Tsunade's, and past chapters confirming her seal makes her physically more powerful than the latter, she still doesn't have the range of offensive capabilities to put her on par with either Naruto or Sasuke. That doesn't mean she's hit a glass ceiling and won't progress from here.
IMO, Sakura doesn't possess Sage Mode at this point in time (unlike what a few of our members believe), but I'm certain she will go on to train in senjutsu; I'm also sure that she will train to use her latent genjutsu prowess. (because despite not being mentioned since the start of part 2, Kishi wouldn't just leave this unaddressed) The reason is I'm sure there will definately be at least one more arc before the series ends, which is only strengthened by the now apparent countdown to Sasuke's betrayal.
If you think about it, Kishi has given himself an excuse to explain Sakura's lack of training development over part 2. If she's been storing chakra all this time, then perhaps Tsunade called off the training until Sakura formed the seal, in case further training interfered with the chakra storing. Now that the seal is formed, she can now continue her physical development without hindrance.
Also, I'll shed my view on the slug issue:
Katsuyu has only been shown using one type of attack (acid spit), and all subsequent appearences have had her aiding her summoners with mass healing and a providing a communications link to everyone she's linked with. However, that might simply be because she's the only slug capable of symbiotically bonding with her summoner to perform these feats, and that she has little offensive capabilities overall, making her better suited to a support role. Perhaps there are other slugs out there that are better suited for combat.