Saw this happen in the States years ago as the net took off-myself and tats were in Detroit, we done "half" of a store with 500,000 45s in we hit late on in a trip. We decided to fly back 4 weeks later-to do the other "half" VANISHED into thin air in the space of 4 weeks-not forwarding address -nothing GONE.
The owner had moved everything in a weekend -his lease was expiring--so he shut up and set off to go on line to save costs-never did find him again!
I think (hope) specialist shops will survive-but its off to the Island I think
Rob