I think not just maglev: a lot of typical bearings could possibly be switched from ball / roll to maglev, saving a lot on friction and maintenance.

Undersea cables are a pie in the sky; current high-load cables in urban an industrial areas could be made much smaller, simpler, and lossless.

I wonder if transformers, currently huge and expensive, could be made better with this, too; at least the ohmic losses could be removed, and thus a lot of need for cooling, and the fire hazards.