Originally, OV-101 (aka Enterprise) was supposed to be rebuilt to flight specifications after the completion of the approach and landing tests and used as an actual OV (as can be seen in the OV designation-10x numbers indicate flight vehicles). However, it was found to be cheaper to rebuild a structural test article, Challenger, instead, due to changes in the Shuttle design since she had been built, so she was instead used in other roles (such as fit-testing SLC-6 at Vandenberg). After the Challenger disaster, she was again mooted as a possible replacement, but it was once again found to be cheaper to use a different route, in this case assembling a set of spares that had been built for the program.
So, how could you see a flight-certified and launched Enterprise, and what effects would this have?