When I originally replied there weren't any reasons why beyond "Fucking consoles." But about the money going into PC games, if you look at the
EA financials thread their Q3 revenue was $428/493/505 million split between PC/PS3/360, in a quarter where PC was up 110% after TOR and BF3. Unless all the profit from the consoles is being spent on ivory-backscratchers by the 1%, that's related to money that's budgeted back into development.
Without the consoles, the PC slice has to be 3-6 times its current size to bring in the same revenue that currently goes towards multiplatform games. It doesn't seem realistic, and with chicken-and-egg unknowns the PC slice might even get smaller in the hypothetical scenario.