Indeed, there were some in 2017 who thought that, in the words of the song, "things could only get better". SWR soon proved otherwise.
It seems to me that standard class catering is likely to disappear from most routes within very few years. The DfT's preferred model is evidently to cut timetables and/or train lengths until the majority of services run full and standing if not crush-loaded. That's not compatible with either trolley service or passengers getting to a buffet car, or indeed for the at-seat system discussed above.
Such catering as survives would be in first class only (as a way to drive patronage there even when its seating quality is reduced) with something like complimentary basics (tea, coffee, biscuits, crisps etc.) and paid-for sandwiches, cakes, and hot snacks delivered to f/c seats only.
At present there's no way I'd head out on a long train journey without taking whatever food and drink I wanted with me, either from home or buying on the way.