Rail has a far higher profile... Is that a pun?
As an under-sixty, at least on paper, I'd agree that the IR to IE changeover seems to be the era that interests many enthusiasts of my age.
My thinking at the moment is that the nostalgia isn't fixed to a particular era, though. What seems new and uninteresting today will not necessarily seem so twenty or thirty years from now, hence my desire to be able to run a 2020 layout.
In twenty or thirty years time, Noel may be complaining about hydrogen powered flying DART's, and reminiscing on how lovely it was to have ICR's to marshall in a yard instead of floating around in the boring old sky.
Interesting to read what Iarnrod and Railer say about the 071's and the 111's - that even those models don't accurately reflect the operations of today due to changes that have occured.
Even if the grey 071's and the NIR 111's WEREN'T sold out and unavailable, it would be hard accurately model 2020.