I don't see Star Wars stuff going away for about a decade - heck, it might very well continue long after that.
I think right now they're focusing on what they think will sell - a mix of rehashes, repaints and new figures. It seems right now is the time to try and fill in slots with some EU stuff we want and more movie figures, with some nice OT characters being made. Then I think they're going to shift their focus over the next few years to the TV series and the like, with some stuff still coming out that harkens back to the films.
Somewhere a few years down the road, we'll probably get something again like The Original Trilogy Collection, with newer sculpts (mostly rehashes) of the figures from the OT. New packaging but still harkens back to the vintage days... heck, maybe this whole like will be in something that is similar to vintage POTF cards.
Anyways though - as for what's a good mix? I'd like to see about 10 waves per year in non-film years. Out of those 10 waves, let's say about 4 new figures per wave (let's say 1-2 GOOD
repacks/ugraded figures per wave), with some sort of good repack here and there mixed into each wave. Then throw in VOTC style, and I'm liking about 40-45 new sculpts each year, and anywhere from 15-20 repacks in the basic line. Then you figure in Battle Backs into the mix too... perhaps a mix of some new stuff in Battle Packs mixed with some repacks.
So, to my liking this is what we'd see -NEW STUFF
Basic Line New Sculpts - 30-40 figures per year
Vintage Line - 5-6 figures per year
Battle Packs - 2-3 new Battle Packs per year with all new figures
= 40 - 60 all new sculptsREPACK STUFF
Basic Line Repacks - 20 figures per year
Battle Packs - 8-10 "old" Battle Packs per year with mixed in army builders/repacks
= 40 - 60 repacks per year
The repack stuff, if you're an opener - you can take it or leave it.