The pvp will have staying power, but the pve is probably trash cuz it's a similar ruleset as GW2, so the usual dodge or get 1shot I'm thinking without healers.
I am definitely not considering the pve at this point, but I also haven't watched many vids or researched it much after I learned there is no roles.
In the end I think it will be a niche audience and not and incredible amount of players, but who knows