I post this here because I think you can do a great job at this.
I would love to see the MMO’s in this game get a re-work. For starters, maybe a feature to do server maintenance or upgrade to reduce the amount it costs to run an MMO since I feel like it’s unrealistic how it is. Make it a hefty sum of money for an upgrade and a much smaller yet expensive cost for maintenance but both curb the operating expenses of the game for a time, and maybe the upgrade can allow for more features?
Secondly think an MMO should have some new features that are not available for regular games. For instance, you can set a level cap, and the next expansion might raise that. Also an MMO game should have some sort of trade feature, PvP ,real-money store and cooperative missions, with each of those aspects being able to be tweaked and upgrades as the MMO evolves. Positive tweaks will ensure a longer-lasting game while negative changes will just help kill the polularity and revenue of the game faster.
Lastly, we need a new kind of game. On top of small, medium, large, AAA and MMO, we need free to play. While I personally stay away from those, they seem to be very lucrative in the right hands, and its only right to include that sort of model in this game.