In 5 years some of the alts we know today will collapse and new ones will be issued.
The investors will be much more than today because of the volatility of the market and the promising high gains. What is essential to happen is the use of the cryptos in our daily life.
It is mentioned before, and I believe it that the start will be from the unbanked populations of the so-named 3rd world.
I hope that the developer works more the security of the coins. Many lose their money and it is unfair.