@OP
That's very noble of you but i don't think it's worth the money, even if Hawken's IP would cost 50.000$, wich probably would cost more.
Hawken already has failed 2 times, see it as Duke Nukem Forever.
There is no saving Hawken, not with the current content, and name anyway...
Maybe you can start your own project, something fresh like 'Luak' already suggested. With a few guys, a small project, and who knows...
But if you do buy Hawken's IP and manage to create your version of Hawken, PLS don't call it Hawken