All you guys scared of TrashCash need to remember, IT IS JUST ANOTHER ALTCOIN!

In order for it to "kill" bitcoin it has to convince the merchant service providers to switch from taking the true Bitcoin to taking the new BitchCash.  I would think this means that the merchants themselves would need to agree to the change. 
You also have to convince all exchanges to swap their market pairs to it as well.  I do not see that happening but to ensure it doesn't, we need to put pressure on those services to stick to the real one.

All TrashCash is right now is one really, really, really expensive and useless altcoin.