Whilst I think this is proposal is a good idea it would cause some problems for smaller universities, libraries and NPO.
As an example, my partner created the island for our University, since then I have been the only person actively working on this project. I am not a technologist so most things take me a very long time.
Small universities do not have either the funds or the workforce to work on "high risk" projects. It has been two years and I am only now starting to see a very few lecturers starting to use SL for teaching.
Even though we don't have very high traffic stats we do play