[Thought]

I used to want an open source Graal myself, but i've retracted that, because there are far many more bad things that would occur than good things. Graal is very dependant on client-side operation still, a lot of the cheats that are done are through client-side things which are not checked through the server, if Graal were to go open source it would be way too easy to write your own client (or modify the existing), so that will possibly let you do as you wish, or cause some nasty problems with the server.

So, unless there were some heavy rewrites, no, Graal should not become open source.