MMOs that use a no-sub+free-to-play-based model tend to fizzle out within a few years if they don't have a large team and large budget behind them, due to the inconsistency of whale spending on F2P shop stuff. Compounded with so many copycats over the past decade, and there are only a few MMOs really worth playing nowadays. I've played a few now dead MMOs that had so much potential; it's a cautionary tale.