The Hives, Crystal Nation, and the Gryphon Kingdom were repaired and restored to their former glories in three-years time. Cadence once again ruled the Crystal Palace as did Chrysalis her hives. Gilda helped everyone she could, doing good deeds left, right, and sideways.
Cadence, Chrysalis, and the newly-throned Gryphon King all made negotiations with Celestia and her fellow alicorns, including the Elements of Harmony and Nature. The Changelings would be allowed to roam free in Equestria as long as they did not cause trouble. If one drone did cause trouble, he was condemned by the Hives-- as in, sent to the gallows. Unless he was proven innocent. They still had to feed on love, of course, but criminals who did serious misdeeds were sent straight to the hives. It was simply a sacrifice that needed to be made in order to keep the balance of the treaty.
The Gryphons had a new route on which to transport goods: They first had to stop at the Palace of Nature before going to Canterlot or the Crystal Empire. It was much easier that way because from the tops of the Palace one could see the landscape and thus make accurate judgements. It also used less energy on the individual.
As for the Crystal Ponies, they too roamed free within Equestria, though as with all species, some chose to stay secluded. Many adored their crystalline coats, and some ponies from the larger cities made it to the Crystal Mountains to become crystal ponies themselves. As a matter of fact, all the alicorns in the Palace of Nature went there as well just to see what it felt like. And for the hell of it, they brought TV-girl with them to see if it would affect her the way it affected them. It did give her a crystalline figure, though they were shocked.
At last, balance has been restored.