[Retric]

As price drops it would be useful for a wider range of things. Gold high voltage power lines for example are physically better, but cost prohibitive.

Gold is directly useful for a huge range of things and the use in industry provides a very real price floor.

[salty_biscuits]

I think the tensile strength/density might make gold transmission lines a bit crap. Maybe steel core with a gold outer where the AC current flows, but not sure if it would actually be any better than aluminum.

[Retric]

Plenty of applications like transformers where mechanical stress is a non issue. Corrosion resistance is another useful feature that can be applied to a wide range of use cases.