It's weird to imagine but I think the future is for most things to be bought on line rather than shops, so fewer shops on the high street. For a shop to survive it's got to provide something that is best done in person on the day. So perhaps a bakery, or a tire change place (what are these called? I don't own a car!), a restaurant or a cafe, etc., but not clothes.
I don't feel sad for "the high street". I prefer it this way. If anything perhaps it will help to reduce the foot print seeing as shopping is a hobby for so many and they crowd city centres to do it.
I frequently visit a village that is popular with tourists and I am occasionally drawn into a shop either to wait indoors somewhere or whilst chatting with a friend. The spotlighting means I'm trying to see past the glare at an item of clothing, it's crowded, the changing rooms aren't great - I don't need a cute or inspiring message, I would however like a door. Then they don't have my size, or I like the item but want it in a different colour - and a quick google of the style takes me to a shop that offers exactly that item in that cut/fabric/size/colour that I want. Also often the item is on sale at a discounted price somewhere else - think Toast trousers where JL had the last pair of their stock so reduced them significantly where Toast had not actually reduced the price in their stores.
For me, while their are brands I like, I no longer shop primarily by brand, but by fabric and cut of the pattern. So having a store of just one brand also doesn't suit me. There are essentially about 10 clothing patterns that I wear, half in summer, half in winter. Tese suit my shape. I'm not interested in looking at the things people with other shapes wear. I also no longer shop randomly and purchase on a whim. The items have to fit what I already know I am looking for, so wandering into a shop aimlessly is more to kill time or to chat with friends, so just seeing an item that's nice isn't of interest to me.
I also now exclusively buy toiletries on line because it's become tedious to pop into a high street shop only to find they don't have an item in stock. I can find it easily online and cheaper.
I think online shopping needs to improve. I once accidentally purchased shoes from Italy via Amazon, it can be hard to remember to check the sellers destination so Amazon needs to make this clearer. I also think they could improve their use of drop off points including the post office. And places that send their items in a cardboard box that's ridiculously large if you wish to return only one of the items (I've taken to using a bin liner and putting the label on that).