Problem is, people are already going to shell out $50 for the Xbox/PS2/GC versions and $60 for the Xbox 360 version already. If you integrate this Head Coach game into Madden, you're either going to have to essentially give it away if you don't change what your charge, or risk losing people if you defy the gaming market and charge like $70 and $80. The $49 price point for name new releases has been established for a good while now, and the $59 price point is likely going to be the standard for new next-gen releases. Nobody goes up on it unless they pack in their own controller (they tried with Madden and Halo 2, and maybe a few other games, to do a "collector's edition" that had some extras and retailed for $10 more, but that didn't work).
Also: I don't think EA "chose" to downgrade their 360 games in an effort to boost them for the 2007 series; the first year of a series on a new system is usually fairly spartan compared to current-gen offerings because they're still getting the hang of programming on a new machine. I don't think EA wants to produce sub-par versions of their games if there's any chance someone like 2K Sports can take the early lead on a new system by offering a better product (you laugh, but this is essentially what happened when 989 Sports made a serious run at EA's football dominance with GameDay/GameBreaker; in particular the early versions for the PS1 played much more fluidly than the Madden/NCAA counterpart, but they didn't keep improving, then they got pwn3d by everyone after ****ting out the dreck they did on the PS2, and now Sony doesn't produce sports games).