Cant see C2 ever going on sale again to be honest, doesn't really make a whole lot of sense for them in my opinion given the new model.
C2 is great. I still use it, but if you do become serious with it you will definitely be upgrading to c3 at some point so keep that in mind (c3 will make it easier to monetise as well as being the better engine after they have had enough time to work on it).
There will always be that portion of the community that doesn't think they will make enough use of it to justify the yearly cost though, and they might be right. For that I would like to see another option where the sub covers use of the exporters/advanced features like multiplayer etc.