You haven't even given people 24hs to answer...
I TRIED computer recording, and I hated it. So I never did any migration, I just dropped my digital projects in the trashcan and bought an 8-track.
I don't think I would migrate any projects. I would finish them in the digital realm and then make new projects on analog, instead of migrating. The migrating seems just too much work.
When it comes to migrating the studio, that totally depends on what you have from the start, I guess. For example, migrating from a digital 8-track to an analog 8-track would be trivial, but migrating a studio from computer recording to all analog stuff is a whole different matter.
So once again, the question is wrong. Pushing "Analog vs Digital" as an important paradigm difference is just counterptoductive.