There's probably lots of neat uses for gold at the moment that aren't financially viable due to the cost of the raw material.
It'd still be more cost-efficient to e.g. mine for gold under the ocean or in the Antarctic rather than send gear up to space to do that.
If we had a huge solid gold asteroid (how would that occur?) floating in a very close, very convenient orbit then maybe it would be cost-effective to send a ship to connect, re-orbit and land it without vaporizing; but anything realistic simply wouldn't be worth the launch effort&cost.
Seriously, not kidding. Lets push 3D printing so hard all we need to do is send a few drones worth "up there", and oila .. free everything for everyone, forever.
(This is actually a constant thing in spaceflight, that comes up because of the scales involved. Similarly to that, any engine able to cut down interplanetary travel to reasonable lengths (days, weeks) will have energy output of a WMD, and could be used as such.)