Maybe when he's older and nothing works with him. The team getting him would have to give up significant value and have enough pieces in place to build around him and fast. Ovi doesn't want to sit on Columbus while guys like Derrick Brassard share ice time with him.
It would be like Rick Nash x 100. If any Caps GM simply mentions "Ovechkin" and the word "trade" in one sentence Leonsis would fire them.