I've been thinking the exact same thing Jesse. We've sort of discussed this in the "future" thread, but I get the feeling the 3 3/4" line is moving towards 5 POA by the time the new movie rolls around as well. Especially if the 6" line really takes off with collectors. It seems to be off to a good start, and with Wave 2 including Fett, Solo, and Slave Leia, you could really see the popularity pick up. We'll see I guess. They've been selling pretty good here, from what I've seen, but honestly, it seems like anything "new" from SW is selling. A starved market and all that.
I'm right in line with Jesse's thinking - a scaled by "collector" 3 3/4" line, spaced out, and more focus on OT. We're at the point where they have really covered so much, and covered it well, that we don't need 50 figures a year here - at $10 a pop. I'm also picking up the 6" stuff (the OT ones at least, although I do have Maul too), but I'm still a 3 3/4" collector through and through as well and hope we don't see that go away.
I haven't picked up any of the new Legends/Mission Series stuff yet, so I can't speak to their quality. I don't hate the cheaper, lower articulation idea as much as some do (particularly for figures we already have great versions of anyways), but I think if the paint was as wonky as some have said it would bother me more. Otherwise, I kind of dig the $6 pricepoint, and the vintage type throwback that line offers. I'm actually really looking forward to the Han/Chewie and droids packs, as well as that Jedi Luke. Now, when it comes time for Ep. VII, and it is all new characters (or looks for old characters) I think if everything was 5 POA it would bother me more, but I don't know for sure. If I'm being honest, unless the quality (sculpt/paint) really took a dive, I think I'd likely still buy some stuff, especially at that lower price. If they were moving figures like the ROTS days, maybe the price would even drop back to $4.99.
Back to the topic though, I do think Hasbro is gearing (hoping?) that the 6" line will become THE collector line. We'll have the Legends style for the basic line, and then the 6" collector figures. Vehicles, beasts, etc. will be exclusives or not much until the movie years start. We're really going into uncharted territory in a couple of years with new movies each year (at least that's the plan), so we may even have a new "focus" for the action figure line(s) each year.