Thing is that the railways are not such a special case- think of the many people over the decades that have had to seek alternative employment as their industry has been mechanised/robotised, in factories especially. Or at the checkout in the supermarket- yes, a rather lower skilled job, but when one person is supervising eight self-checkouts, probably on no-more money than a "manual" operator, you can see what's happened.However for the Guard in most of these areas where DOO did take place, it was the end of the world. Most of the Guards i worked with on the Chiltern Line either left the industry or moved away. Me i had to move to Willesden and join what was then the Network South East North Division later to become Silverlink and now London Overground. I regard myself as being one of the lucky ones having been ab;e to stay in employment ever since. The only draw back is that since 1988 when the initial work on the Chiltern Line started i have always had those three magic words sitting quietly on my heavy shoulders.
News International employed far less people after the move to Wapping due to the automisation advances there. The new printing plant at Broxbourne, that replaced Wapping, employs, to the best of my knowledge, a third of the printing staff that Wapping did, yet the plant can print more papers, with less waste and to a higher quality.
There's benefits to modernisation- but a genuine problem is what to do with the people it displaces. "Not working" is frowned upon by society.