I feel like there are two issues here, and i'm ok with keeping them separate.
1. Should centerfires be legal? IMO yes. People hunt for different reasons. Many don't have the luxury I have of private land and the time to hunt. Potentially there is a safety issue, but maybe it would mean less shots as the accuracy increases. I bought a savage model 11 in the spring for coyotes in .243 and put a redfield 4x12 on it. As an average shooter, it didn't take much effort for 2" groups @100yds with factory loads. If a guy isn't going to get much time in the woods, I think there will be more clean kills for them. We could argue all day on the ricochet or guys taking 400yd shots, but jackarses will be jackarses no matter what. I personally would be better at 200 with my .243 than 150 with my muzzleloader.

2. Is it sporting or hunting? I personally wouldn't use these calibers for deer unless out west on a spot and stalk. There's no way you can convince me that shooting a dialed in 30-06 from 200yds to take a booner, in your heated tower blind drinking pop/coffee and eating donuts, is anywhere near as difficult as a trad guy taking one at 10yds. So I'll stick to my compound (settle down trad guys, I haven't graduated yet) and maybe get out the .44 1895 with iron sights a time or two. In my mind, "hunting" occurs maybe at 50yds. or less, but that doesn't make me right.