I personally would like to see MMOs gravitate to an online/offline model. That way if they do shut your favorite MMO down. Then you could still play it offline. Like Diablo 3 ect..
I know that in-order to do that they'd have to make it solo friendly and not MMOs are like that. I guess that's why I'm so attached, to the play with your friends. Even if their offline feature in Fantasy Star Universe 2. Imagine if every MMO had that feature plus an offline mod. Say you could save your friends characters to a folder in your games files. Then when your offline and your playing you can just invite your friends characters to your game while playing offline. The AI would control their characters of course but if done right or in the case of City of Heroes and they was decked out in the best IOs. It could really work.
I started a thread on the official forums with this as the premise and laid out my ideas for how this would work conceptually. Having had a few more years to think about it, I think its more difficult than I first suggested, but on the other hand I also think that the barriers I first thought could make this unworkable are actually not insurmountable. So I simultaneously think its more possible and more difficult than I first assumed.
The most complex part of this is how gated progressable gear would work. Meaning, stuff that makes you more powerful that has prerequisites and significant effort to obtain and have developmental paths to increasing their ability, like enhanceable weapons, craftable gear sets, and powers and items that improve under gameplay conditions. A system to develop those in single player play but be normalizeable in multiplayer play would be non-trivial, in my sense of the word.