The RTS genre got drowned by cellphone apps doing the same thing.

The games don’t have high technical requirements, so it’s a perfect match for phone/tablet apps.

However they’re also quite easy to program, and easy to make graphics for, so the market is swamped with clones of clones of stock code and stock graphics, so no developer can approach it seriously anymore.

The best games in the genre are good because they have carefully balanced gameplay, but that takes time to discover for the players, so even if someone made the perfect game, it’d never be discovered amongst the shovel-ware.