Possible scenario in my mind- 1/2 way thru season Sheens declares this will be his last at WT, shifts to 'mentor' role whilst remaining at WT for last 1/2 of season and remains ARL coach. Folkes steps up for last 1/2 of season to head coach, Simmons reads the writing on the wall and quits since Teflon not there to as head coach.
I cannot imagine any scenario where he will be extended nor can I see him quiting early unless the team peforms miserably in first 1/2 of season and the agitation for his head extends to the WT boardroom and not just a significant portion of the fan base.
I've said it elsewhere here but Sheens has now mde the 2010 squad what he wants. Let him bear the responsibility for tis performance.