There are very many stations that have been unmanned for decades, some with 4 or more trains stopping per hour and serving in excess of 250k passenger each year. In recent years I've seen a variety of stations used by less than 250k passengers a year, some with very few trains a day, yet still manned. Clearly one size doesn't fit all. Many of those little (some quite big architecturally) stations are among the best kept on the railway.
All the stations on my line have been unmanned for 50 years, perhaps 2 tph but mostly under 100k users pa, and now have TVMs. More are using apps. The world is moving on. The life goes out of stations without a human presence, but how much does that cost? It's an issue the railway has been facing since at least the 1950s and there are no right answers for all. Commercially I'd have to close a lot of ticket offices if it was only ticket revenue that decided it. But many I wouldn't because there are a lot of exceptional local situations.
In this dispute existing booking office staff employment must be protected even if their current specific roles may not.