I don't necessarily mind the 5 POA stuff either if the sculpting is there, which it has been lately. I do like getting more articulated versions of the main characters and troops, which TVC does a decent job of covering....eventually. And that's if you can find them. I pretty much just preorder most everything more since retail has become such a gamble. I happened to hit up WM at the times waves 2/3 were showing up there, and found what I needed that one time. Otherwise I only saw Wave 1 at all stores, all year.
I don't see them moving away from 3 3/4" stuff, at least until after Episode 9. Think of kids who came into the franchise primarily with TFA, and started their collections there and moving into Last Jedi (not to mention Rebels, Rogue One, and Solo), and have maybe built up their own little collection only to have a scale switch with the supposed capper to not only the new trilogy but the Skywalker saga? That would stink.
That is assuming kids still care about the non role play toys, which is probably a lot more hit and miss than the old days. I personally hope 3 3/4" never goes away, it is my preferred scale and I like the potential it offers for vehicles, beasts, and playsets. Plus, it is where Star Wars began. Unfortunately, it seems six inch, or larger scale at least, is where most toys have gone. I can't think of much in the aisle, aside from the recent Jurassic toy line, that is still in that size. They might have primarily been so the figures could interact with the dinos.