User blog comment:AdmiralPedro1stFleet/FANS PLEASE READ. Drew Karpyshyn's ORIGINALLY INTENDED ENDING/@comment-1440333-20130525133723/@comment-4452849-20130525205106

Well it's supposed to be Shepard's last appearance. And they said they don't want a clone of them or another soldier for the next protagonist role. And while it would be interesting to have the clone come back and play main villain, that's for them to decide.