investing in altcoins is fun and so many choices and also it could be x5 and x10 like you said, but remember there is so much ico is scam and beware useless coin that could die in future. I do love btc and i still believe bitcoin still good option cause it will be more safer to invest on bitcoin than altcoins that might be turn out to be scam coin and also im still pretty sure bitcoin value still able to increase eventually.