Oh man, I wish they were. I still have a little hope that we fight the governments' plan to destroy the concept of privacy before it's too late, so I really wish privacy coins are the next trend.
I believe it's gonna turn into a trend as soon as the govs will start questioning their citizens based on blockchain analysis the government itself has done. Once that happens, people will inevitably look for a way out of control and surveillance. My personal choices are Monero and BEAM, although I have not read as much about BEAM as I read about Monero.
Monero, having privacy as a main focus, will likely continue to be the leader of privacy coins in the future as well. And since the IRS is looking to break jusr XMR and Lightning Network, one could say that means they are either not afraid about the rest of privacy coins or they have been able to crack the other privacy coins' privacy features easily.
The more governments will fight to make privacy a crime, the more features Monero's team is going to add to counterattack the gov. I trust the devs and I find XMR incredible tbh