That sounds very funny. Go all in all altcoin ? Why would anyone ever want to do that ?
You have to take some measures and not put all you have totally in altcoin as you may end up sweating in your intestine once the unspeakable happens.

No one can predict what can happen anytime and you always have to be careful of the move you make when you are trading. In as much as the chance of altcoins getting pumped is possible, you still have to spread your tentacles little by little so you don't get burnt.