Do a web search for a graph for UK Coal production over the last 150 years or so.
You will notice that there are a number of sharp dips.
These represent big strikes.
Now look closely. You will notice that after each strike, Coal production rises again, but it never ever again reaches pre-strike production levels.
Each strike has caused permanent and irreparable damage to the industry over all.
The slow decline of the UK coal industry was inevitable for many reasons, But it could have had a much softer landing but for the behaviour of the NUM.
It was the NUM that killed it.
Rubbish, It was a political agenda that killed it..... Look at all the laws they were "introduced" to aid said political agenda.
The country does need to go on strike if only to watch London burn.