I don't know I guess it kind of depends, I have two systems in my home. Firstly I have a modern system consisting of a mixture of audio research components and emotiva, secondly I have a vintage system in a bedroom. The vintage system consists of a mixture of Yamaha, Marantz, Fisher, Akai and Sony components.
Now the majority of my vintage system has been restored, but even still after anywhere between 30 years of age and 60 years of age in the case of some of my vintage components they're still going strong.
Now my newer system is all effectively new or I should say components are no older than about 10 or 15 years. The audio research equipment is exceptionally well made and I envision that gear to last for quite a good number of years before it needs any sort of servicing or work, if audio research product history and general customer consensus is anything to go by. The emotiva amplifier I use is US made and generally the reputation of the company is such that I envision the amp last just as long as my partnering audio research gear. Plus the amplifier itself is of a modular design so if something were to go wrong with the left channel for example I could simply get a replacement output module from emotiva and slide out the broken one and slide in a new one, and I've been informed by emotiva that they have spares for years.
You know the general consensus seems to be that" they don't make it like they used to" but I don't necessarily agree. I think it's all price driven and I think of you pay good money and purchase quality products then those products will last for decades to come. Obviously if you buy junk well you know what you're going to get.