I think a good idea to have Data return might be to have it connected to the "great bloom". May be instead of ripping him appart, he was pulled thru the anomaly right during its creation. And since Data can pretty much exist in space indefenitly...he could still be floating around there on the other side of the anomaly somewhere. Maybe he deactivated himself while he waits for resuce or something.
The other end of the anomaly is the Magenelic Cloud specifically an area that may or may not even exist anymore or at the very least was devastated and said anomaly has been closed off.