Very interesting op, bbs's may be essential for meshnets running at shortwave.
The creation of a sneakernet will have to depend on the dedication of anons and more importantly, location.
I don't see copyparties happening though.
Also, have you ever heard the occurrence of digital shortwave?
Only problem would be the equipment, but can you imagine nodes spreading a few hundred - or even thousand km.
Makes for a very accessible network.
And imagine DX skipping with it, although with digital signals bouncing off the ionosphere I highly doubt the connection would be anywhere near usable for casual use - hence the bbs