The pro-armed forces media are astute enough to know that whilst Puma may not be in Afghan; it is doing/available for; other jobs. Jobs that will need replacing by Chinook should Puma go. ie the concetina effect still equates to a loss of helicopters when said lack of rotary has already attracted bad press.
If tensions on the east coast of Africa warm up, the Puma could be home and dry (literally). I doubt Puma will disappear this side of UK SH coming out of Afghan and it has been suggested in the press that this could be after 2015.
That MoD money is in the AW pigy bank is no security for Wildcat/Lynx at all. The precident on that has already been set on several projects, and the decision makers always look forwards not back. ie Cancellation will save X future expenditure rather then we have already spent and therefore we are committed. Cx P2, Cx Wildcat and string out P1s lifetime would be the penny pinching solution.