Not really sure how a strategy game will work with the F2P business model. F2P relies primarily on cosmetic items and XP boosts for revenue.
Well if Age of Empires online is any indication it won't work at all. Players complained of super high grinding for basically everything or paying through the nose for things like new civs. And C&C 4 had some of the worst grinding ever in a RTS, not to mention always online DRM.
“The greatness of a nation and its moral progress can be judged by the way its animals are treated.”
- Mahatma Gandhi