Brand Longevity

I don't often hear about this. You see brands like McIntosh that has been around for 65 years so when you buy it you probably feel confident that you will receive support for years down the road. Maybe forever. What happens to say Ayre owners if Charles kicks the bucket? I don't want to be a downer but this has to matter. What about my Rogue gear? Should I send Mark a carrot and a workout DVD? What happens if a meteor lands on him? What's the game plan? Can I still get parts? Should we be asking these manufacturers about long term guarantees?

I'm seriously thinking about a big time purchase as in my last integrated until I'm collecting ss in 20 years. Where's my guarantee? Maybe I don't have to worry because hopefully there will be a technician who can handle it.