I like cata, but look at the situation objectively:
You have a finite amount of resources, and a flagship server Lordaeron. Lordaeron is considered to be a flagship server primary due to its popularity; one update to Lordaeron affects 3 realms directly, and may affect all servers indirectly depending if said update is applicable to all realms being streamlined to the same core. All servers being on the same core has been a goal since the original Lordaeron still existed.
Fast forward to now. You have a limited staff with limited resources and servers that cater to 3 expansions that all need a lot of work. How do you prioritize? Popularity.
Why is cata so unpopular? Your PVE community has abandoned you. Fire Lands was fun, Dragon Soul was terrible, you can call this a subjective opinion all you want, all one needs to do is look at the retail subs during dragon soul, and look at who stuck it out during the expansion...pvpers, which is largely what warmane cata servers are now. 95% of your PVE community has gone back to wotlk or mop for a very good reason.....cata raids are awful (working or not) mop and wotlk raids are more enjoyable (working or not)..this isn't conjecture, its been beaten to death time and time again on the Blizzard forums.
Which is why the no growth cata servers are left with 1 of 2 choices: stick with what you have with no intention of updates for the foreseeable future, or move on.
It was a **** expansion, prove me wrong.