So, if Wolverine can regrow lost body parts and such, what the hell is the point of The Lizard? I mean, sure, The Lizard's a savage monster, but there's plenty of them about. Gotta have something unique. Keeping the characters unique helps make them that more interesting, and, although I don't think Conners is required to become The Lizard again in USM, knowing that Wolverine can successfully do what Conners failed to accomplish without flaw kind of takes away from his character, I think.
Obviously, regrowing a finger's not that big a deal, but regenerating from an eyeball!? That just sounds like a writer trying to be bold - and turning out crap.