I personaly don't like the idea of leaving a working aircraft, however I am glad that there are those who enjoy the challenge.
The Paras are by no means the only good Inf unit around but they are still bloody good and scare the
out of most. Their Para training is clearly a major part of their identity and even if this was all there was to it then I would say we should keep the capability.
As others have said before however, it is never a good idea to loose a capability, even if we cannot forsee it's use in the near future. Even if they never dropped in anger again (unlikely I think) the very fact that we have the capability keeps the enemy guessing and denies them the oppertunity to concentrate their forces. For this reason and others it is essential we keep them trained.