I doubt most here are seriously doubting an all out cancellation of the JSF program is written in the stars, that being said there are many scenarios possible for a lot of the current customers whereby the original order changes so much that alternate set-ups for their Air Forces are very likely.
Al least in Europe, and possibly also Canada and to a lesser extent Australia, the original order volumes seem more than ever unlikely to materialize.
There are many ways where the losses are going to have to be made up by other options, combined Air forces, more integration between different forces concerning maintenance, training, etc... (UK-Norway-NL-....?), maybe even cheaper to use platforms to make up for lost numbers (K50, NG-Gripen, F16V,F18SSH).
There are even scenarios out there whereby the biggest customer (USAF) might have to look at a second, cheaper to use platform to assist the F35 over its lifespan (weaponised TX).
The JSF , as it was originally conceived , seems to have gone through enough changes for this thread to warrant its existence and ,for now, to be kept alive.