I agree. I would like players to use the other maps that are available. If they want to stay put in TC3, then that's wonderful, but I don't think many players even know about the other land available.
What would really be neat is have TC3/EA-Land merged into one location. You would start out on the far-zoom, and if you wanted to get into the test center, you'd click it and be prompted to upgrade to the new version (if need be). That way literally everything's put onto one grid, and it's easy for everyone to use. There'd be no "login to _____" version of the game, and it'd wipe out a lot of confusion.