Meh, signing a contract act in a TV show is not some noble gesture, it's a business arrangement. Actors negotiate early exits from contracts all the time. Staying on a show for the full contract term but just phoning it in, which also occurs frequently, is also not admirable. Acting is a job and, like other jobs, some people complain about their jobs when they are unhappy. While it may not be good form to complain about it on Twitter, that will blow over. I doubt the network or anyone in the cast or crew will care when Wu returns to work in July.