I mentioned it before in my earlier post...
Most MVP diehards have moved on to The Show 08 on PS3 because after 4 years there is finally another great baseball game. There hasn't been a consensus "great" football game similar to The Show in the football genre. If Madden 09 is a great game, people will finally be able to forget about NFL2K5, which is a really sad statement for the NFL gaming industry (just Madden these days of course). There hasn't been a great football game since NCAA '04 and NFL2K5.
If you were to 100% mimic the NFL's situation to baseball and we only had MLB2K8 on the consoles this year, MVP would still be booming like no other.
As for what made MVP so great, it was a combination of basic/simple controls, realistic game play, great dynasty/owner mode, and most importantly the game was/is fun as hell to play. And after all the mods it is a virtually glitch-free game.
So just because a PC game is easier to mod means an Xbox game gets the nod? Doesn't make much sense to me, they're on equal grounds as far as I'm concerned and if you think the stuff the modders do for MVP is easy I suggest you take a long look at mvpmods.com and eamods.com.