I think that there are a lot of useless altcoins, but some of them have a great potential. I am holding a few futurocoins and recently I've found out about Futurobet, a casino which let to use my coins. So even smaller crypto like fto are useful
For me no one is useless and every altcoins has benefit for us but it is about users that how we use to deal with it, those who are selling at panic will not make money with any coin but those who are saving and holding will get profit out of it, I am sure it will never get useless but as time passing altcoins are getting more famous and useful investment for us.