You make it sound like nobody will ever make any additional maps for the game. Valve have a commitment to not let it stagnate for at least 6 months, if not longer and i'm sure others will let fly on it once the SDK is available.
Actually, there is already a server running a modified version of cp_well that has flags. The messages "capture the enemy intelligence and return it to your basement" are erroneous, being that there is no basement, but it works. I would tell you the server name, but I didn't get to make note of it.
EDIT: This is server-side, since it's only an entity change.
This comment was edited on Sep 25, 20:40.