The Kenmore 90 series is pretty much the same as the Whirlpool I have - parts are still a plenty and inexpensive. I should know since I practically bought a new drivetrain.
They will be out there for quite a while still.
The only part I could not find new was a timer. However, since it is mechanical, I can patch it if needed. If I have to use a bunch of toggle switches and pushbuttons, so be it.
And I agree - those are extremely good machines. Keep it as long as you can repair it. My washer is 27 years old and the neutral pack is just starting to get flaky. I have the parts to fix, just need the time. Oh, the $5 agitator dogs were replaced a few years back - a 10 minute fix.
What really kills these is when people use the bleach dispenser a lot and spill bleach. It runs inside and rusts out a couple main frame rails which is very costly to repair. My sis did that - they quoted 1k to fix.