I mean now that we have them, I wouldn't want them to be removed since being an allied race allows them more unique options. But they're pretty much just as distinct as Wildhammers, which will just be a Dwarf customization option in Shadowlands.
In the end, I feel like allied races should offer.. well, a new race. Not on a technical level. They can reuse a skeleton, but a new model, a new species, not just a variation of an existing one. Vulpera do that well. Zandalari do, too. Mechagnomes do this poorly, as do Lightforged, Highmountain, Mag'har, and as much as I like them, Dark Irons.