Yes altcoin have a future like Ether, Wave etc. They have bright future. But every coin are not. It's just my opinion.
I agree, but sometimes it's hard to find out if the coin has a furture or not.
That's why I look after them at least once a day, just to go sure.
If you want to invest, forget and look again after a month or two, I'd buy coins like ltc and eth.