[m0cemdave]

The problem is that in this country, museums are little valued and seriously underfunded, and property (premises, including reserve storage) is very expensive. And that's likely to be even more of a problem as a result of the ongoing economic effects of the current pandemic.
There are even suggestions that museums should start selling off items from their collections to finance their storage and running costs. These ideas have been floated regularly over the years by some influential think tanks, but are now being taken more seriously.

I remember spending some months working in Paris in the 1990's and being surprised (and impressed) at the large number of small, very specialised, museums dotted about the city - many of which I visited. I think it's largely down to different cultures. Maybe some of our foreign-based readers can suggest useful solutions to the question.

edited to add:

I was under the impression that Fort Perch Rock threw out the maritime radio exhibition some years ago. A bit like what happened to the radio museum at Bletchley Park.

Jeremy's idea is a good one.