That's probably quite true, I'd most likely just park it on a pretty planet and take a few beauty shots before putting it away in some secluded hangar forever. For any serious game related stuff there are always ships that do anything and everything better than the Mk IV.
The only difference is that Fdev would be $10 richer (or however much they'd charge for opening it to the general public) + some cool paint jobs and nameplates, and I'd have a rather useless but pretty ship that I never use....

Oh and there'd be some very loud, butthurt forum members who dont like to share, shrieking and throwing hissy fits about how their toys are no longer exclusive. On second thoughts keep the MK IV, its not worth dealing with the inevitable tsunami of self righteous temper tantrums.