I agree that SE will release 2.0 regardless of how many or few subscriptions XIV has. To me it seems like they have gotten to the point where they are being obvious about the fact that they do not currently care about keeping/getting a player base, and so they figure they may as well get what small amount of money they can from subscription fees as it is still better than nothing.
I don't necessarily think this is a bad decision from their POV. But I imagine that the number of players will shrink drastically, and the server populations are already on the small side. So I feel bad for the people that really love the game and want to keep playing, but that will have to deal with a teeny tiny population that gets very little "new blood".
Regarding the idea that people will come back for 2.0, I think it is the kind of thing that is tricky for a person to decide so far ahead -- maybe you will be happily playing another MMO that you don't want to leave, or maybe not.