The fact that 4e and it's support materials represent an awful lot of design work and a radical rethinking of the game's core system forecloses on that view. Like it or not, the system is full of new material. It's not like WotC is selling you stuff you've already purchased (unlike say, Pathfinder... I kid... I kid... mostly).The fact that they have put 4E versions of many 3.5 splatbooks lends credence to this view.
Loyal fans can be an irritable and hard to please lot. Take my word on this, I live in PhiladelphiaRadical change to increase the "bottom line", whether real or perceived is going to make loyal fans of the game angry.

The interesting thing about the new WHFR is they seem to be going after a new market segment. People should be happy about this experiment. Aren't gamers always complaing about the need to attract new players?