ruemere said:creating a new system is not an answer, since you're basically relying on being able to tear away a chunk from original consumer base. Pathfinder RPG, because of its differences, is likely to become a product similar to 4E albeit with less of following.
True20 and other systems also suffer from the lack of compatibility - you either play 3.x or one of those.
But in the rpg industry you have to create new things. 3.5 needs and will be evolved because as it is, regarding product support it has already surpassed its limits.