The Wormhole wrote:
^^Problem with your theories is that the Abrams Enterprise would have to have a different registry than NCC-1701. Since it still has that registry, we have to assume there was no other Enterprise before it. Well, aside from the obvious, of course. Likewise, having the ship named someting else would mean that other ship would be NCC-1701.
The number would have been allocated when the ship was still on the drawing board. So, to my mind, this suggests that the construction delay was not just with the Enterprise. Possibly her entire class, possibly other ship classes as well.