You guys said it. We really had a pretty glorious and unprecedented run of great stuff there for several years. I think it goes without saying that we'd all like to see things like a return of super articulated figures, large accessories, etc. but times have changed. Personally, I have been buying the 5 POA stuff, I don't hate it, but I've been more selective and army building is close to nothing. I get most excited about the newest WM Black Series offerings, but also dread trying to find them. A happy medium would be nice.
Honestly, one of the most exciting collecting times for me was when the VOTC (and later VTSC) lines were announced. We had our nice, medium articulated line as the main line, then we could look forward to the (at the time) "ultimate" versions of classic characters. Sure, some could and have been improved on, but most were pretty nifty. If they just busted out that vintage packaging for a special line like that (offered at all retailers like VOTC), and we got 18-24 of them a year, it wouldn't be too bad. Mix in smart repacks like the Royal Guard, Ponda, or other army builders/main characters to keep costs down if you have to.
As much as my heart is with the classic characters, I think we have to realize that barrel is about dry. Finish out the vintage line, maybe update a few here and there if needed, but probably focus more on the newer movies. Then we could continue to get "ultimate" versions of main, primary supporting, and army builders while still having the more affordable (and profitable?) main line. Add in just a little articulation there if possible, and it would be nice to see a bit more in the vehicle/beast area.
As for the six inch line, I don't see why we can't have both. Sure, many have hit discounted prices, but I think overall the line still does have a fair amount of heat around it. I personally enjoy both lines. If I had to pick one, I'd definitely choose the 3 3/4" line, but I think there is room for both.