I agree with you Mercy. Cataclysm was the expansion where things really started to go downhill and the private servers reflect this.
The reason I personally believe a reset or a new Cataclysm server could be in both Warmane's and the players interest, is because of your excellent quality.
While Neltharion did suffer from a fair share of bugs it was understandable you could not always prio the server when it came to fixes as you had other servers that needed a lot of attention aswell. Yet now most of your servers are running just fine and there are very few (if any) critical game breaking bugs or broken things, which means that a new Cataclysm server could get more attention.
The private server community might not value Cataclysm as much as the previous 3 expansions, but one can't deny there is a substantial amount of players playing Cataclysm, and I believe Warmane might be able to pool a lot of them here by making a new Cataclysm server. For unlike a lot of other private servers you have the resources needed to make the server strong. Hence you can claim a large share of the Cataclysm community across the private servers.
Penny for your thoughts?