Hm looking at recent RTS´s this game has a lot of potencial to grab people that enjoyed age of empires style of games. Recent games like grey goo and act of agression suit more a different crowd, but even them are struggling a bit to find a core audience.
Still looking at how Age of Empires, RIse of nations and Age of mythology HD editions are popular on steam i think theres a very good chance to grab a core playerbase to play your game. Even though these games have fundamentaly flawed multiplayer lobby implementations with a lot of people complaining about lag in the steam discussion sections.
Also i dont know if you know 0AD.http://play0ad.com/
Its a free open source game that has been in development for years now, even had a indie gogo campaign with relative sucess. But in the end the game is still plagued by pathfinding issues(the hardest part to implement in RTS games it seems), lackluster multiplayer lobby system and with graphics that were awesome years ago but slowly keep getting worse with time.
Also something that might be worth mentioning is that normaly having a core fun single player aspect to your game can be a key feature in making people stay, and it also helps them learn the game and get interested in the factions. Sometimes multiplayer is fun but the single player is the first thing people do when they open your game
Without spamming more lines of text
i think 0 AD and the HD versions are the best competition you might face in the near future, theres some unanounced microsoft game studio formed but i doubt its anything age of empires related.
So id say you do have a spot in the market