

Superconducting magnets don’t heat up naturally, not without breaking. All we’d need to do, is engineer an isolated environment for the magnet, and there’ll be no chance of it heating up, except maybe for an intense solar storm overwhelming it’s magnetic shield.
Unlike earth, where there are multiple potential sources of heat, in space the only one of note is the sun. So yes, you can’t remove heat via conduction or convection, but that also means that you can’t gain heat from it. If anything, that simplifies the design.
Merit as a musician can only take you so far. In any creative career, the big famous artists aren’t just good at doing their craft, they’re also very good at making business deals to sell them. And even that’s not always enough to become a superstar, you also need luck - your breakout/masterpiece needs to coincide with the latest trend, and preferably early in your career - a one-hit-wonder might be enough, but maybe not.