That pretty much is my only reason for getting ME3 is to finish Sheps story and I don't see Bioware spinning off unless Ray and Greg Relinquish their positions in EA. Even then I don't see Bioware surviving unless they goes back to square one and make an RPG that the fans want and not something that will get you a profit in the short term but will screw you over long term.
They are hiring MP devs, meaning there could be MP in ME3 or a spinoff, and they said MEs trilogy would be about sheps story, but ME would be a franchise.
BW could go back but they would have already lost alot of fans.
I can't say I speak for everyone, but I enjoyed ME2 because it was actually fun to play. DAO was fun in a different way. When I started hearing about DA2, I realized that they were getting rid of the parts of DAO that I enjoyed, and replacing them with nothing to fix the awful encounter design or combat system.
It's not that ME to ME2 is a bigger change, so people complaining about DAO to DA2 change a hypocrites, but that ME2 was fun, and DA2 isn't. The "cut out useless crap" approach worked for ME, but it didn't work for DA, where my primary enjoyment of the game came from the relatively complex mechanics.
Saying it was made more fun is debatable.
And they didnt cut the useless crap, they cut the mako then sold veichles back with firewalker, they cut the ability to swap armours, dlc, guns, dlc, now a key plot point is dlc.
Instead of removing siome things and selling them back they should have improved in those elements and refined them, they didnt.
Bioware dosent tackle problems the right way, in ME they removed instead of fixed, then resold the feature as dlc, in DA2 well they arent even listening anymore, no one asked for most of this crap. DAO reminds me of fable (tlc), fable was good, then they changed features and we had fable 2, an inferior game, then they were still in denial (like Laidlaw) and released fable 3, an even worse game. BW just isnt listening anymore, it will do what it wants, even if it results in BW failing.
On the brightside I still have Obsidian. If only they had better testers.
Well I wont miss it.