<slightly OT>
Wow, am I the only one that liked the Diablo crossover stuff?
</slightly OT>
As far as not going d20 being bad for WotC, I don't really see it that way.
Let's say we've got somebody who is a new convert to table-top RPGs as a result of this. They play EQRPG for a while and find they want some new challanges. The EQmaster picks up the Monster Manual, looking for new stuff to kill. They see all kinds of spells listed there that they want rules for. They flip through the PHB and see all kinds of cool stuff they want to port to their EQRPG sessions. They buy a PHB. Then they want new treasures, traps, weather rules, whatever and discover them in the DMG.
It's not a real stretch to see an EQRPG fan wanting one or all three of these items to make their EQRPG better. Not to mention Oriental Adventures (don't know if there is an EQ equivalent or not), Manual of the Planes, Monster Manual 2, Epic Level Handbook, blah, blah, ad nauseum.
The simple fact is, if the game is not d20 and is based on 3e, WotC still produces the stuff that will be easiest to incorporate into that game. That's good for WotC.