this is surely the golden age for preserved railways in GB, with a volunteer workforce and day-trippers keeping them afloat, but if that dynamic changes there will be an impact on the viability of lines' survival in the coming decades--and the volunteer base is particularly vulnerable I would have thought as (a) fewer of us these days have much spare time to offer in older age as we have to work for a living (!) for longer with pensions shrinking in real terms and more debts for longer, (b) the pool of enthusiasts is shrinking, especially as the memories of 'proper' loco-hauled trains let alone steam fades from the population, and 'reliving' our youth disappears as a driver...
am I being too gloomy? I am not sure the likes a a few 'celeb' train-spotter influencers will be enough to galvanise the 2000s+ generation (ie those not in the 1960s-1980s enthusiast group) to prop up for free the raft of jobs needed for maintaining preserved railways, from tearoom staff to fitters and platelayers.
time will tell, but GB preservation may wane and so we should make the most of what we have while it's here