That's a good question. Again, our industry is somewhat unique in this regard. Even when a console is discontinued and is no longer for sale, the parts will be available. I'm not saying they will be in perpetuity, but again, our three major console makers.... There are still people playing PlayStations 1 and 2.
Furthermore, to my earlier point about the ease of repairability in general, most of the issues you might have playing an older console you can fix on your own. There's a tri-wedge screw, something you could use to deal with most of these electronic repairs, and that's something you can do. Again, it's in our members' best interests to make sure that consoles work for as long as possible and that manufacturers retain some of the parts needed to repair these consoles for many years after they discontinue selling them.