Well, it took them 2 months to fix defense of dathomir and then they only ran it once, so we're still missing 4 zeta mats.
It's taken them what, 4 months or so to not even care about the screw up with the beginner quests and how some people arbitrarily got 20k in shard shop currency and some got bugged unbeatable quests.
So given that them rebalancing the raid would benefit players, I'd say we can expect to wait a minimum of several months, and potentially not even expect them to fix anything. In fact, if they do change something, it's more likely to be a "fix" that just screws something else up because they're not good at their jobs.