Nobody on the CW is going to make Seinfeld money. The network is broke.
Post Smallville, do we think Tom can act?
In my opinion, no. He can't hold a candle to Ackles and Padalecki (who's improved by leaps and bounds over two seasons ago). Heck, he can't even compare to Rosenbaum, Mack, or Glover. There's no incentive to improve because Clark's storylines are so stagnant.
To be fair I doubt that they'll do well once Supernatural ends either. Most actors/actresses from the CW don't do well.