In my opinion, the best solution would be to launch a second server and give older players a temporary free pass to build up some basics on the new server while they can still unleash their full creativity on the original server. In time, NQ could gradually reduce the support on the old server, launch new features only on the new server, in order to motivate veterans to move over to the new server.
As an alternative: A full wipe on the original server, but with some kind of booster given to the older players to temporarily speed up the skill learning. After all, many have paid to play for a long time, and they don't like their skills being reset without having any benefit from their investment (with time and money).
I also want to add, as an alternative for schematics, the way they solve this in other games: science research. Unlock schematics by investing time and resources in research. Make it a research tree. Buying schematics was the worst possible thing.