This seems to be going off at somewhat of a tangent, in terms of references to older piston types, which is not very relevant to Shoreham?
There's more chance of keeping a piston type airworthy, the skills are not being lost, and many of the main operators are passing on the knowledge to younger people already. The issue as ever is owners with deep enough pockets to restore and operate them.....and they are getting fewer, but with established maintainence operators like Air Leasing, ARC, Air Legends, and TFC of course, although TFC's fleet is ever reducing with SG's increasing age. Afterall, BBMF are contracting out their winter deep maintainence work to these operations now.
The subject when talking about post-war historic jets however, is effectively a non-subject now post Shoreham, as there are very few left now because of the post-Shoreham CAA changes, meaning owners have sold or grounded them having been unable to sell them. Other than a few JP's and the single(?) L39 that's all there is, flying in civvie hands and there's not likely to be any more than that now.