That will never be done, I played source for many years and for the year that they updated it and ruined many competitive features it wasn't that great and actually made me buy a new computer to even play the game with an HDR update. Now I can see them release a new Counterstrike in a few years that looks and plays tf2 but thats about it.

I don't know, it seems like that game is basically done (in the sense of being a complete, finished work of art).