I just saw that episode the other day, and caught the Archer IV reference, but, IIRC, the 'proper' Enterprise still went to Archer IV after the correction of the timeline.
It seems as though it exists in both timelines, and probably should, given the placement of the Archer's in Federation (and Starfleet) history...
Though, obviously, I don't think that the reference to Archer IV has anything to do with Jonathon Archer or his father, it's still something that'd make for a neat tie-in, for roleplaying purposes (or perhaps for writing purposes, such as the Trek fanfic contest).
Greg
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