Televised blackjack tournaments were basically a failed experiment. When UBT's considerable investment in the idea was not a success, I think that spelled the end of the effort. UBT's business model was killed by the passage of the UIGEA in October 2006, but ratings were an issue even before that.
GSN also transitioned out of the World Series of Blackjack and replaced it with poker programming, which has been a tried-and-true success on TV.
Will television blackjack be back? Perhaps if the UIGEA is overturned someone could make it work. I'm not optimistic.
As for ClubUWin, my wife plays there but she plays poker not the blackjack events. If the idea appeals to you, it's probably worth a month fees to give it a try. Don't expect much financial value, but you may find it worth the money for entertainment.