This thread has had the usual deviations via coffee, carriages and toilets....but when talking of "peak preservation" there probably will be one or two railways that close in the next couple of years....(.but may well re-open with new management). With well over 100 heritage lines that is really to be expected.
However as has been said before, there are quite a few lines expanding with very credible plans and a proven track record of success. These
include :- L & B, GWSR, CVR, GCR, N & L, Southwold, Rother Valley etc. There are also more steam hauled main line excursions (in 2019 and planned for 2021). There are several specialist companies doing boilers, carriages, overhauls for preserved stock as well as highly regarded workshops on preserved lines.
Post Covid many people in this country will not be travelling abroad as much and will be looking for "experiences" and day trips. Some may want to become more "involved"
I think the Preservation Peak has not yet been reached.