I don't mine anymore but there is no way I would point my miners at a pool that switched to Bitch. If anyone is still using any of the Chinese mining pools, this should be a wake up call. I think a lot of people have already realized this which is why Slush pool has been growing.
The only reason Slush is growing is because all the other miners have abandoned BTC for now.
Miners aren't loyal to anyone or anything. They want them bills paid and some profit. That's it. If that dimness kills BTC they'll probably grunt and find something else to mine, even if there's nothing left.
If you don't think 70% of the hashpower moving from bitcoin to an altcoin is a problem, I don't know what else to say.