The only way I see it happening is if we make a 2 for 1 or 3 for 1 trade using our expiring contracts (Murray, Herrmann, Brezec) and sign Webber in one of the free roster spots.
Otherwise, I don't see what he offers that the guys at the bottom of the roster don't. We don't really need another big that badly. Sheed, Dyess, Maxiell, Johnson, Brezec...hell, even Herrmann is like 6'9". Samb looked good when he got a chance as well (even though I know he's out a couple months now).
Adding Webber doesn't make a lot of sense to me. Unless they upgrade someone in a trade and free up a roster spot or two. Then, why not?