I think the salvation of RTSs is a merge with games like DF, castle story, towns, and so on.
They can get pretty good ideas from this genre that has been booming recently. Modifiable terrain, custom buildings, mining, etc.
I hated what many companies tried to do by transforming RTS games into online games like AOE online, stonghold online, etc. But apparently none of them was succesful so luckly they'll give up on this idea.