I don't think anyone can definitively say.
With Judges, Lawyers and Accountants now in charge anything goes.
That said, I don't think Robby relies on GM Racing Division (which is now a skeleton of what it used to be) for anything other than money for his off-road ventures. Other racing disciplines will feel the affects from a technical aspect.
Is Robby's contract with GM or Hummer, because it appears that Hummer got sold off.
http://online.wsj.com/article/SB124385428627671889.html GM at the last minute also found buyers for some unwanted subsidiaries, including German-based Opel, which is being acquired by a consortium led by Canadian auto-parts supplier Magna International Inc., and the Hummer brand, whose buyer remained undisclosed.
I think his contract was with GM, covering both the Baja and Dakar efforts. It's hard to say what happens with the Dakar effort now, if Hummer is sold but the contract is still with GM. Maybe the new owner of Hummer will want to foot the bill for that part of the sponsorship, which, depending on who the new owner is, could be a good thing for Robby going forward.