It isn't the biggest technical concern and at least they have principles, but I expect something that looks like Monero + easy to mine will eventually appear and turn out to have an advantage in the real world. Although it is hard to predict because it isn't completely clear what (if any) impact the algorithm difficulty has in practice. But if there are big datacentre mining a cryptocurrency with dedicated hardware then that means there are people with skin in the game who want it to succeed. Seems like a better equilibrium than whatever the Monero people are aiming for.