I believe that everything is an excuse to build in some kind of blockchain because of the hype.
All of this matter is still in its infancy and, even though Bitcoin is almost a decade old, only in recent times did Cryptocurrencies began to explore other applications for its concept.
All these "honest" altcoins (real projects, not scam intended) will be eventually filtered by time and the market.
The scam coins will either get regulated out of the space and we'll see some people going to prison or people will just learn how to avoid them and they will just vanish (less likely, I think).
Anyway, I believe there is a practical future for crypto currencies in the near future with projects like EOS, BitShares, maybe Cardano and some others, especially those that develop cross-chain technology and fee-less (or almost) transactions.
We'll see...
Cheers!