The players abandoned Cata before Warmane did. I would be really ****ing happy if y'all stopped blaming the server. Warmane had a pretty steady development and updates for Cata. I know because I was an active part of it. When DS hit, players just started leaving - exactly like it was on retail. Now, give me one reason why they should focus back on a realm which has 300 online players during peak times. If I were them, I'd just completely shut down Cata and use the server machine for something better than catering to the needs of 300 crybabies, y'know what I mean? They're actually compromising by even ALLOWING Cata realms to still exist, and yet you're here crying about development. Go to another Cata realm then, if you so much want to play this expansion, but, speaking from experience, I can assure you that none of them has more than 1k population and none of them is better than Warmane in any significant way.
One of the more popular Cata servers is currently focusing mainly on its Legion project. The other one of the more popular Cata servers is no longer popular, having the same population as Neltharion.