TBH, if you could get away with it, it would be a perfect us
Start again. OK, with FPS being so big right now, the MO of 90% (made up statistic) of gamers is to buy the latest CoD, and play the shit out of it online until the next big thing comes out. They've cut single player campaigns so much, we're pretty much at the point of them not bothering anymore. So I'd say in the 5 years they've spent developing this stuff, it's more or less redundant.
However, I think you've totally got a point with the text based stuff. If you got it right, you could make an MMO experience like LA Noire, but have some important NPCs as actual PCs, so when you're trying to bluff people, interrogate etc... It could actually be a real person.
God knows you'd have to think about it, but it could be great.