How about a proper rebuttal, rather than name-calling? Of course we can always resort to handy little LOL-MEMES TROLL-MEMES when tough questions arise right? 
Do you know that you can divide Bitcoins? Even if someone would by 99.99% Bitcoins the whole global trade could be done with that 00.01%. Althought the whole scenario is as plausible as asking what if somebody buys all the food from the world or something like that...
The whole scenario is as plausible as someone buying all the dollars out of market faster than Bernanke and the boys can print more. I am pretty sure that you don't worry about that scenario very much, and that's for a good reason: It is impossible. Same with Bitcoins.