I think privacy coins will be big in the next couple years. With the U.S. Government changing the tax laws and other countries around the world trying to crack down on crypto, a way to hide what you're doing with them will help tremendously.
Absolutely agree with this.
This is why I've been looking at privacy coins all this time. I believe that they are one of the most useful coins to one at this time where everyone is trying to get a piece of information on everyone else. Blocking tainted coins is probably going to become a thing soon, and people will start tracking bitcoin transactions to see what you spend your BTC on.
Privacy coins fix that, essentially. It's really a battle between Monero ZCash and Dash so far. IOTA promised some anonymous updates in the future and it'll be interesting to see them as well.