Personally I will switch to Ethereum Classic, a crypto-currency I like a lot. However, most people will probable stop mining as there will not be a crypto-currency that propose as much security, safeness and peace of mind than Ethereum.
+1

In fact i already made the switch to ETC, future looks bright for both of these cryptos that being said.
If the ETH mining is more profitable, it is better to stay with ETH.