Just because Vohu Manah (or however Nutaku will translate it) is good, doesn't impact Asherah in any way. We're also still five months away from her too.
For now, Asherah is THE game changer for Water builds. And that doesn't change even after Vohu Manah, although it might change "the perfect Water team" which is something that only ultra whales can worry about.Which doesn't matter much since Water SSRs are chuck-full of debuffs, but eh.