For example, some of the coins that have been going up in price recently are complete garbage and it's a matter of time before their technical limitations become apparent to non-technical people.
I think I have a pretty good idea about how easy/difficult it will be to scale different cryptocurrencies based on the algorithms they use. Many of the ones in the top 100 list right now are essentially impossible to scale beyond a certain point, eventually they're bound to hit a wall.
Most investors right now are just randomly moving their money between coins. They wait until issues start showing up and then move on to another random coin. This is very inefficient.