I used to play FF14 religiously, met so many friends on there that I still play with. Very few of us except the most dedicated have quit the game, since the pace of updates (and being adults) have prevented us from playing the game enough to justify the sub price (~$15 USD a month).

However, I still enjoy MMOs and have moved onto a game I used to play some but never invested a TON of time into: Guild Wars 2. My girlfriend and I have been playing it some when we have time off work, which is rare right now but the game has no sub price and doesn't feel like it demands your time in a way the sub-based MMOs do. They have little to no FOMO, horizontal progression (no gear treadmill like WoW or 14, whatever endgame gear you have is mostly always relevant), a fun open world with enjoyable mount travel and a pretty decent community. The game has had its ups and downs over a year but I feel like, from a working adult perspective, it's the only MMO I'll ever have time for.