I dunno, it still seems like putting off the inevitable: 3.5 entering the closet of older versions of D&D with a slowly dwindling (and graying) fan base. The main problem for it being that any new blood that comes in will play the newest edition of D&D, which is 4e--or at least the vast majority will (sure, some will join Pathfinder groups, but most who come in will buy what is on the shelves at Borders or B&N, and that is 4e). The only hope for 3.5 actually significantly growing again is if Pathfinder really takes off and starts its own "lineage", even with later editions (just imagine the hoopla when Pathfinder 2ed comes out in a few years!). The idea of a popular 2nd fiddle fantasy RPG interests me--none, over the years, have really succeeded beyond cult status (Rolemaster, Runequest, Ars Magica, etc)--and I think Pathfinder has a chance to do it. But it would have to pull of a hat-trick of taking on its own identity and staying close to D&D-feel, both at the same time.
The point being, for an RPG (or any commodity, really) to thrive in any way, it has to grow. It cannot just maintain, because maintaining is stagnation and stagnation leads to gradually decay. While I currently play and enjoy 4e (with some qualms, which I hope to houserulify eventually), I would like to see Pathfinder succeed: Not only am I intrigued by the idea of how a 2nd fiddle fantasy RPG would effect D&D (maybe serve to make it even better?), but I love the idea that there are a diversity of versions being played. However, I get the sense that this recent "Renaissance" is more of a re-balancing; it is the "backwash" of folks who tried and didn't like 4e. That is nice in the short-term, and will lead to a lot of Pathfinder sales, but eventually the question has to be asked: Where are the new players going to come from? Let's say that 10% of 4e converts re-converted to 3.5/Pathfinder; that's a nice chunk of cash to spend, but it probably won't grow larger unless Paizo sells enough Pathfinder and invests in getting it into B&N and Borders.
I am curious if anyone knows what percentage of active D&D players switched to 4e and stayed, and how that compares to the other edition changes. My guess is that it is a smaller percentage than with 3e, although still the majority and perhaps greater in number.