I think yes, they do have a future.
There will be more variations of coins; and of course the ones reflect a value will stay in the game, the ones don't will be vanished. Pick the right ones, and you will profit in the long run.
Maybe you just do something wrong? My opinion that altcoins have a very promising future, very profitable to hold bitcoins now. But if you are trying to invest and hold altcoins you obviously do something wrong, some altcoins really profitable now, but always be a risks.