pretty sure even farmville has at least 10x-20x the players of haven 2 when it's obvious that haven 2 took way more effort to develop, so no it's not turning into farmville.. it's doing way worse despite it being unique.
reason why they're at two digit players is because their failure to communicate with their players and just slaps 2000 players with surprise suscription model, if it was decided it should have been shared and discussed about.