Go on?
Probably best RTS game going on currently is Beyond All Reason, and that's because guys are doing it as an open source clone/followup to Total Annihilation and Supreme Commander Alliances and not actual business (but they started to look for a way to monetize it to fund future development).
Good luck convincing an exec to give you 200 million $ to make a new RTS for the 50 player based market out there who's playing the oldies anyway: AOE, RA, SC, etc.
It's a small and saturated market that's long been fished out and no point investing into, other than HD remakes/remasters of previously mentioned established IP.