It's actually amazing how many brand new OEM parts are still available for these rigs. Try getting new parts for an early 90's hatchback and see how you go
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There's also a few other things to consider. I'd point out that every part for all these rigs are still available, in wreckers yards all over the world. Toyota discontinuing manufacture of a particular part doesn't truly mean it's "no longer available", it just means you can't order a brand new one in a box with that nice Toyota sticker on it. Many used parts are perfectly serviceable, and you can often find them in very good condition, it's just not as convenient, or ironically, sometimes as cheap, as I've often found it can be cheaper for me to buy a new part than it is to pay for a used one from a wreck, through partsouq at least.
Then there's the aftermarket consideration. Say I can no longer get a new Toyota factory radiator. I'd prefer one, I'd happily pay for one, but at the end of the day, I could get by with a good brand aftermarket radiator. It may make me cry a little inside to fit it, but I'll get over it eventually and learn to live with it. There's also companies and industrious individuals who do/will set out to fill voids of important parts that go NLA, at least in terms of things that wear and would truly put cars off the road if they can't be replaced.
These are things anyone who drives truly classic cars would be familiar with today I'm sure. I've never owned a classic car, but I'm pretty sure if you have some vehicle that was built in the 60's, your first thought when you need a part isn't to try and order new parts directly from the original manufacturer. The 80 series hasn't crossed into that realm yet, but it's edging closer to it bit by bit each day.
I'll also add, I think we're a bit spoiled with all the parts we can order new. When I first got my 80 I was raiding wrecks for parts, since that's just what I was used to doing. The idea of ordering new from Toyota wouldn't have entered my mind, because local dealer prices sucked, and I wouldn't have thought 99% of what I was looking for was still made anyway. It was only when I learned about sites like partsouq and Amayama, which had full searchable parts catalogs, and more importantly, reasonably accurate availability information, that I started my new OEM parts buying addiction. If I'm honest, over half the parts I've bought are probably more vanity purchases than in any way important. I bought a new cover for my fuse box under the hood because I didn't like that the white diagram on the top was starting to fade
