It most definitely would be added, and in this I'm at least 80% sure. This hasn't been the topic of discussion namely because there are other more important matters to attend to such as planning on the expanding of servers, different mods, different games and similar, so that the community may be accessible to an even larger variety of gamers. However, as in CSS, I don't doubt that there will be some premium content for CSGO in the (nearer) future.
Sincerely,
-cHeT [BeWasted]