TerraDave
5ever, or until 2024
Monte Cook is on record saying that 3.5 was planned long before the release of 3e. Sales had nothing to do with it (except indirectly); according to Cook, 3.5 was planned due to an anticipated slump in sales about 3 years into the edition. From what he describes, that slump common in RPG (or at least d&D) releases.
EDIT: turning typos into some semblance of English.
Thanks to the magic of ENWorld, you can see it here:
http://www.enworld.org/forum/showth...ok-reviews-3-5&p=997160&viewfull=1#post997160
It can actually be interpreted in different ways. Worth taking a look at for those interested in origins of 3.5.