It's a shame really, because it'd be great to see a weekly Superman show on TV again. Plus, if I'm honest, I'd be much more interested in a TV show, than another movie at this point.
Actually, so am I. As for Welling, if he doesn't want to do it, chuck him and get somebody else. It's not like he's the first guy to play that part anyway. A new Superman show would be a golden opportunity to recast across the board.
Of course, the downside is the producers would probably hire even younger "prettier" actors , and we'd be stuck with a cast who couldn't act their way out of a box.