Yep, CoH is keeping the genre alive, along with SC2. I think there was Planetary Annihilation that was hyped quite a bit, but i think it is dead now. Heck, i even gave money during the kickstarter, hoping it would rival Total Annihilation
It's a little disappointing that 20 years after Total Annihilation, it is still in some ways the pinnacle of RTS's. The options for unit behavior, control grouping, etc, etc are still better than anything out today. Having the campaign narrated by James Earl Jones rocked.