The episode would have ended with a surprising revelation. "We would have found out that Tiberius and Archer were responsible for the creation of the Mirror Universe", notes writer Judith Reeves-Stevens.
How utterly retarded that would have been. WAY too much of the NX-01 just happening to be a part of pivotal history points. Now if you just had the story where Tiberius hijacks the ship and gets back to the MU, that would have been very cool. I like the twist on the Tantalus Field and this very neatly allows Shatner to be plenty old.
I wonder what sort of chemistry Archer and Shatner would have had.