Orgrimmar has always been a very boring place to RP. The entire city is designed for either Orcs or Tauren and Trolls, and the latter two have much nicer places to RP. RP was confined to the Valley of Honour as Valley of Strength/Embassy area is full of OOCers and in general the city just doesn’t lend itself to RP with few buildings that aren’t barracks or vanilla and an auction house in every district meaning a lot of people spread out across the city.
The spark that lit the fire was the kit RP and ERP problems that started pervading the area due to a particular group who have now moved on. There’s still some RP there but generally now that a lot of guilds have evacuated the Horde is very spread out now. My guild has settled down in Ratchet but I know that there’s RP going on from Razor Hill to the Crossroads to Bloodhoof Village and all the way to Sunrock Retreat.