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My thoughts on longterm reliability are that you'll eventually run into fusibles going open. They cannot take sustained current, by nature of their function and were often undersized to add a higher safety margin in the 80s-90s gear. The years of thermal cycling also add to them popping.
Then you're left with a dead or partially working set. For the past few years, I've noticed many more fusible resistor links opening. I am convinced it is age related, since there are often no other problems with the equipment once replacing them.
Audio gear...forget it. Yamaha, Optonica, Technics, all the Japanese makes of the 80s used them in droves.
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