Definately would buy this for 360. Endless possibilities for online and the xbox live. Bring in the big names from the sport. Make new sleds and featured products available from the live downloads. And even if not being able to go "everywhere" make a small mountain range or a few select famous climbing mountains to play on. Base the chances of getting stuck on rider ability points you earn through peer pressure challenges(boondock challenges like slalom courses in the trees, climbing certain shoots, doing gaps with tricks for cameras, etc.) and also races. Earn sponsors from both sled companies and aftermarket parts/apparel companies. Possibilites are endless.
Would like to see, tuning options on the sleds, older gen sleds to start on cause nobody starts life riding on the new and fastest sleds, and also physics that match a heavier toy, I would be mad if I was ready to hillcimb a 155" and it turns on a dime and handles like a dirt bike.
Good luck and if you want any help on this just PM me.