So what IS the problem with Merlin? (other than cost, and how does that compare with the other options?) Nobody has yet criticised it in this thread, and I can't recall seeing much criticism other than cost and some "Just because its British it must be crap / just because its American it must be great" comments that Wastelands built it?
With regards to such an 11th hour change in programme / priorities, do you really think you'd be getting new cabs in 2012? Surely such a late change would effectively mean a new programme, and all the inherent costs and delays? You'd also have the Puma and Sea King soldiering on with no upgrade until the new aircraft are eventually (if ever) delivered....