While I'm not a big red meat eater, I'm all for replacing beef with bison.  They have a smaller environmental footprint, healthier meat, and of course are a native species (in North America.)

As the previous commenter mentioned, bison doesn't taste like beef - fair enough, but neither does goat or lamb.  A lot of people are into making patties from bison...hamburger and sausage are on my list of 'things to do with the parts you'd otherwise toss.'  I'd bet a nice steak or pot roast would win over any meat eater.

I just can't figure out why it hasn't caught on yet.  I'd buy it every time, but that, except for a one-time special, they don't have it in the local grocery stores.