I have a feeling dealers will have a pretty hard time as so much kit is imported from stronger currencies, so will rise in price substantially. The price of new kit will certainly go up, as will everything else e.g. food, clothes, cars or whatever.
The opposite side of that is those who, like many here, live in the vintage/classic market will see the kit we own increase in value as the £ drops against the Yen etc where the best of this kit is so popular. I’ve noticed a massive upward shift in the Discogs value of my record collection (up by around £8k/£11k median/max over the past week). I’d not be surprised if the prices of vintage idlers, valve amps, Tannoys, LS3/5As etc shifted similarly.
PS If you need stuff, e.g. a new cart, stylus, foreign-made amp or CD player or whatever I’d buy it now rather than wait for prices to adjust! Local kit will also go up in time too as materials and energy costs have obviously increased.