I also think that Archer would take the chance to command a new warp 7 starship but I don't think that soon means soon. To reach warp 7 starfleet needs a far more powerfull warpcore. This one would be to big to fit in an Daedalus-Class vessel. So I think the first ship that was big enough to carry such a core was an Constitution-Class vessel. And in the time they were constructed Archer would be an Admiral or to old to serve as an acting Captain.
The end is only the beginning!