)
The objective wouldn't be to get eye-candy, and nor would it be to produce an all-singing all-dancing bugfixed GLQuake at the end of it, but rather to provide a good solid reference that people coming new to the Quake source can use. They would be able to see all the work that needed to be done collected in one place, and would be able to implement the tutorials themselves and learn a lot about the engine (or at least one part of it) while doing so.
We'd end up with a really nice pool of collective knowledge and I don't see how it would be anything other than an "everyone wins" situation.