The 22r isn't a very good engine by today's standards. I've had a bunch of them. They're low power, inefficient, and have poor reliability by today's standards. A typical 22R would rarely exceed 200k miles without engine work. Usually at a minimum you'd be replacing head gaskets, dealing with oil leaks from the chain case and/or oil pan, and be replacing timing chain/guides by 200k. A 1GR laughs at 200k. For a 1GR, probably 99 out of 100 will get to 200k with one set of spark plugs and 20 oil changes. I fully expect that the next gen engines will be comparable.There's no reason a person can't continue to own one. But for most everyone else there's better options out there.
Obviously that ship sailed long ago, in this modern world we're just not going to get a simple, naturally aspirated, underpowered, 4cyl from anyone.
While that may satisfy a few niche users that's not what most would want. It's a different world, engine tech has progressed so far we (the collective "we") expect way more power and performance from a small 4cyl, especially when coupled with an electric motor.. While the 22R is a true legend, it just doesn't compare to what can be made now.
Hardly anyone want's their truck's performance to have more in common with a tractor than a modern vehicle.
While I "miss" my '85 4Runner and often wish I hadn't sold her Every once and a while when passing a big rig going up a pass I remember the not so good parts. Crawling up the pass in 3rd going 45mph, getting passed by or being an obstacle to the big rigs. I surely don't miss that and couldn't see myself going back.
Sure if I had all the money and space to keep multiple vehicles it'd be nice to have an old 4cyl Toy with a Marlin that could crawl anywhere. For me RN I want my 4X4 to be my daily driver, to get me over the pass or out to the desert in a timely manner AND be able to wheel when I get there. I have pretty much all of that with my '80 but I want good mileage too now.
The 22r was great for its era because other engines were only lasting 100k miles of service life. It is not by moderns standards. It would be hard to find any current engine that is less reliable.