http://us.battle.net/wow/en/game/class/rogue
Really, Rogues and Ravenholdt are the same thing. If you claim Ravenholdt doesn't care then Rogues don't either. So why would rogues get a class hall at all then?
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This actually grossly simplifies Wrathion as a character. Wrathion hates the Black Dragonflight before him, and Ravenholdt was largely taken over by the Black Dragonflight at some point in time (perhaps it was around the time Cata started, maybe earlier, no one knows). Unless there was some sort of power or resource Wrathion could harness from the area, there's literally every subjective and emotional reason to
leave Ravenholdt for Wrathion. Locality is not even a factor, it's that this was the place where he was locked in the basement, surrounded by some of the beings he hated most. He was manipulated and tortured by the Black Dragonflight as well as the Red. It doesn't make sense for him to stay there because it's in his own character design to do so.
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Ravenholdt and Syndicate were actually two competing groups of assassins and thieves. Syndicate was formed out of the remnants of the nobles of Lordaeron, while Ravenholdt was a long standing group of master assassin's for hire. The Syndicate wants control of the region, and to use slavery to their advantage (both of which they lost in the second war). Ravenholdt views them more as a nuisance, a competing body that makes it harder for them to function. Their dispute is largely business related.
Ravenholdt is also home to the Assassin's League, which is a sort of inner circle of master assassins. I'm pretty sure that sounds like the perfect atmosphere for a rogue class hall.
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Other things of note:
-> Garona has ties to Ravenholdt and the Assassin's League.
-> We don't know everyone from Ravenholdt that died during the Fangs questline, only a few of the names.
-> Lord Jorach Ravenholdt was unaccounted for during the Fangs questline, and could be dead, fled, or left the manor like Garona.
-> I think most of the conflict around this is a combination of Ravenholdt having all the right parts of what a class hall sounds like, but sits as a loose end for every perspective. Both common class hall suggestions are completely plausible/practical, but leaving Ravenholdt as a loose end for another expansion seems like a narrative failure to me, and probably many others.