I think several cryptos have solid use cases. Those such as Bitcoin/ Ethereum/ Steem etc have a real life application and can solve a problem. The vast majority of the others have no real use case and are simply clones being used for speculation. Over the next few years I think many of the alts will die off as people realise they serve no purpose. Those that actually solve real world problems will flourish. I see core coins making upgrades (such as segwit (whether you agree its a good thing or not)) rather than forking off new coins instead. How can we hope for mass adoption when we keep forking coins? Which coin do retailers etc use? They want to accept payments, safe in the knowledge they will get their money, not worry about which fork to follow etc! This will not help adoption but will slow it down.