While the fixed wing airframe was predicted to be the wrong aircraft and was, it is still not a lost cause. They have four and they should be using all four for their service life [if not actually buying the other two planned].
Buying four wrong aircraft is not the end of the world but simply dumping them is crass. They transport exactly the same role equipment to the scene as the helicopters do and might stay on scene for a little longer and, as newer airframes, they should provide better overall availability. Not perfect but better than nothing.
What is happening is that the NPCC are throwing all their toys out so they will have none. They ditched the Explorers which was sensible on a cost basis but reduced their overall aircraft numbers then delayed the replacement waiting for FIKI [when the alternatives already had it]. Six f/w at Doncaster will solve a lot of short term problems.
Beggars and all that.