I see no inherent reason why it should crash. Presumably we'll see some increased volatility because of the obvious uncertainty this situation creates, but I would not call it a crash. On the other hand, it seems ETC could gain a lot if it will continue to be supported[1][2] and enough exchanges and people jump on the train. Will be interesting to see what happens.

[1] -
[2] - https://medium.com/@zsfelfoldi/a-tale-of-two-chains-3f6d58a9df4a#.h2rq3x4t4