MoogleEmpMog said:
Because Star Wars Saga Edition demonstrated that WotC could produce a significantly better game than D&D 3.5 while maintaining backwards-compatibility with the existing d20 system.
If I can still use my 3.5E sourcebooks with 4E, I will switch. If not, I won't. I've spent far too much loot on this edition over the last couple of years to just dump it for something newer. I'm not optimistic about this possibility.
If, however, the 4E rules are built around the 3.5 SRD with a "plug-in" sort of mentality, there could be potential. By plug-in, I mean, if you want, you can chuck the standard 3.x combat rules and plug in a more streamlined 4.x ruleset instead, while leaving things like classes, races, spells, etc. intact. Or you can scrap the spellcasting system and plug in a system designed to be faster and easier for online play. Or you can replace the class system, leaving combat, spells, etc. intact.
If they go that direction, my 3E books will still be useful, so long as I'm using the systems they refer to. Since most of what I like from those books are class, race, and spell additions, (edit: and published adventures. Those would have to be compatible as well.), that would keep me happy and allow a transition. If, however, I have to chuck my old books if I want to play a new edition, I'll stick with the books.