A slight exaggeration, no? Whilst it's uncommon to find a pub that doesn't do food, I can think of several not far from me. (just outside Brighton).
And "a pub that does food" is still quite far from being a restaurant. Some only do food on Sundays, some have limited menus run by guest kitchens and some get the food cooked by a nearby takeaway with whom they partner.
It starts with Sunday lunches, and slips into weeknights.
It starts with order at the bar, and slips into little “reserved for diners” signs on most of the tables.
It starts with the barman working the sandwich toaster and slides into teenagers in white blouses and knee length black skirts with name tags saying “trainee” asking you to wait to be seated as you enter.
Pubs used to be adult domains where people went to drink and chat in the evenings. Now pubs put playgrounds and bouncy castles in the car park to bring in families to dine.
Of course there might be some classic true pubs left? Perhaps someone should make an app ... arrrgh!
When I visit London, it's not difficult to find a pub with no children and no food.
Things have changed, but you are exaggerating it.
And drama!!Its easy to see the extinction of the classic pub, but in more poverty stricken areas in the UK the bunker is still prevalent.
However, I do know some pubs that have mainly tried to become restaurants.
We once tried to run a small cafe/restaurant, with only about 8-10 tables. And it ultimately failed. After a few months we ended funneling the business to booze and coffee, with as fast a turnover as possible, which was not what the initial place was about. We were an original organic veggie food outlet. Raw ingredients were expensive.
This shattered previous dreams about running my own. But given a cheap ground rent, I might be tempted to give it a go again, but not really for profit. Totally and utterly fried me, very long days, mostly spent at the sink. Not glamorous at all. The co-owners ultimately had to trade up ethics and risk their homes.
We might have done better if deliveroo had been about then.
They opened one of the staff rooms on the second floor as a hostel dorm with a couple of beds, filled them no problem. By the time I left the entire building, apart from the bar itself on the ground floor, was hostel beds. £20-£30/ppn, 90 beds, nearly always 100% occupancy - a license to print money!
Sadly Covid19 will have crushed them I suspect.
All are trying to migrate into dining, as the margins on alcohol have fallen. Those that didn’t become restaurants have basically gone bust. There are no longer any normal classic pubs in England!
I know a couple that tried to rejuvenate a failing “free house” in a tourist hotspot and failed. Passing the spot recently I saw it is now a pub restaurant like all the rest.
I also once talked with the owner bartender of a very trendy micro brewery pub. The beer was their hook but the money came from food and the stables converted into b&b.
It doesn’t invalidate your point at all, I’m just adding detail to a very varied landscape.