On a purely economic basis it would have been more cost effective to produce coal domestically for longer, however there was a political agenda at play as well.
But the point I was making was that passenger transport can't be imported.
But the perpetrators of this political agenda claimed the basis for it was purely economic…
If you ask me, going back to the 1955 modernisation plan, BR standard steam engines should have seen out their design life, running on domestically produced coal until ~2005, being replaced directly by electrification and renewables, with no need for any Diesel, line closures or road building, especially motorways. In 1981 it was concluded that blanket electrification Aberdeen - Penzance could be completed by 2001 and paid for by 2007, but of course it was not paid for.
On another note, passenger rail transport is already imported in that it is provided by the likes of Abellio, Arriva, JR East, Keolis, MTR and Trenitalia.
This is not at all certain. Coal is very labour intensive to produce and even more labour intensive to use in industries. The cost of labour would have risen regardless and made coal uneconomic to use, irrespective of environmental or political concerns.
Rising labour costs were of course a certainty, so this labour intensity of coal actually worked in the favour of a gradual and timely phaseout in favour of renewables. The point was an entire workforce existed until it was culled entirely overnight, which was not appropriate.
My concern is that Britain becoming a new export market for other economies to supply fossil fuels, either coal itself or oil and gas to replace coal, who were less concerned with environmental factors created a much bigger issue than simply giving a few miners a pay rise.
I would imagine in order to close the railways completely, you'd need to regain control from the devolved nations and they wouldn't hand it back without a fight and even MPs within the governing party would not vote for such a proposal.
With railways already devolved to ScotRail, TfW and Translink, it is a certainty that the network could only suffer total closure in England. What are the odds of all 3 building fixed links to a point in the Irish Sea e.g. the Isle of Man to form a connection avoiding England in such a circumstance?
This would definitely change demand. However a self driving car is slow compared to high speed rail and even with autonomy, there would still be traffic. Uber is already self driving from the perspective of the customer, yet made traffic worse in many cities.
Surely the development of autonomous and electric road vehicles is a worst case scenario, even if autonomy is able to eliminate road traffic collisions entirely, which isn’t looking likely at the moment. The issue is single or low occupancy vehicles in general, either carrying either a single passenger as a car or a single wagon/shipping container as a HGV.
"Never" is a very long time though
Ultimately, in 5 billion years time when the death of the sun is upon us and it expands to engulf the Earth, all terrestrial railways will be destroyed, even if they are still operating at this point, but if humanity or an alien species have managed to build railways on another planet, the technology will be able to live on.