But if the containing gallery isn't that important.....
As Angela says, we're not closed to the idea. We've recently introduced the Transport gallery because there was no obvious place to post photos of trains, boats, planes, cars, etc. (Someone actually asked in which gallery they should post photos of planes, and we went, er,

)
There will be some who don't mind how many galleries there are, and I guess others who find too many confusing and are 'spoilt for choice'. There's also the 'lost link' issue relating to any existing images that are moved, as Angela mentioned.
So for now we'll leave it alone and listen to any further comments.