It will come back eventually.
To be frank, I don’t even know what other RTS games are available on MacOS. The only particularly notable one I can think of off the top of my head that I found to have a Mac release is Age of Empires III. There are some other games that technically fall in the RTS genre that are on Mac but I consider them entirely different games. Some lists will cite games like Civilization V but Civ is only really an RTS in a very loose sense, it doesn’t play anything like games like Warcraft, age of empires, or command & conquer.
DISCLAIMER: There probably are other games that might fit, Google comes up with a significantly longer list, but of personal opinion, most of those games are nothing like the Warcraft series and don’t really fit in the same category. There could easily be something that I missed.