This has been a promising ideal for a long while now since certain users like Trinick, Port, and a few others already make their own modifications to the engine to do things. However, all proposals to Badspot in the past to let them create real updates to the game have been ignored or rejected in some manner.
Are there possible drawbacks to this that might be problematic to him?
Some likely problems are that if Badspot worked privately with the modders, he would likely have to hire them in some way since he's a private company. If he let them do the updates on a completely open source basis, he wouldn't have to hire them, but it would likely mean making the entire game wholly open source. Which would mean that anyone could take the code and fork it or sell it or make evil competitors to the official game.
-snip-
The easiest way is that he just releases more updates...
You can't seriously expect that of him.
Still waiting for that semi-confirmed linux version in that vague comment Rotondo made.