I pretty much sure that online gaming is banned or not allowed in some airplanes. In fact they ask us to shut down the phone or tablets during takeoff and landing often.
That would be pretty off topic because gaming and development both have their own shares of drawbacks which we can't discuss context in the gaming forum.
I think MMO would kill the loyal fan following who loved the 1 and 2. It seems like tangent to make MMO or even anything that does not have plot to follow.
These days I kind of my share of the blood pressure. But to be honest I kind of loved playing some of the horror games. Though I know when to keep distance with it. Multitasking and also too much mobile gaming do hurt my health though.
A lot of songs are good some even made it outside the game and included in some movies.. so i think it depends, japanese games have lot of such soundtrack that get popular.