Sadly, LD, from experiences with some of them (both online and off), I'd say there's at least a decent-sized chunk of 360 owners who really don't care as much about graphics, control, or price - especially for a rerelease of an Xbox game - if an improvement on any of those means having to play it on PC rather than their dedicated game system, so it's a big deal for those people.
Apparently Stalin vs. Martians is being released tomorrow instead of today. Not cool, guys. Not cool.