Or, it’s much simpler: the SNW Enterprise will eventually be refit to basically become the TOS Enterprise, and that one will eventually be refit in its turn to become the TMP version.
I've heard this idea before and it stretches credibility given that it's 50% smaller. It'd be like refitting the Enterprise-D into the Enterprise-C.
(The only onscreen Trek to show the SNW version existing during the TOS 5-year mission is the comedy cartoon about the robot chasing the tardigrade all over the ship for twenty years and nobody noticing — which is fun and funny, but I can’t comprehend how anybody takes it seriously; it’s up there with the USS Ravenous where the kids eat nutritious tribbles.)
This is also the short that shows the Enterprise-A being destroyed at Genesis rather than the original Enterprise (with a wonky off-centre name and registry number too). I agree it can be safely ignored for being altogether too silly.
