Can confirm that the Holidays typically drive everything low. Ever since Black Friday people have been on way less and less. Everything will pick back up in good time, especially with the patch in 8.3. I’m not sure if the Vol’kar is what you and your pals would be interested in, but I’m obligated to show: The Vol'kar Legion [H-RP-PvX] under reconstruction!
In any case, WrA has a good RP community that is a bit out of the way. Orgrimmar has become more and more infested with non-RP, trolling and toys, and off-realm phasing in. I wish there was a push to create a new RP hub that wasn’t Orgrimmar’s one valley or Silvermoon City- but it is what it is. Once you get established and meet people out in the world, everything feels far more lively.