I first read about scientists making progress on regrowing teeth about 20 years ago. At the time, I thought this would be a future I saw and crowns would not be something I’d have to deal with. 20 years later, I no longer expect this to be something I experience in my lifetime.

Believes... it may be possible

That isn't really strong confidence.

My brother is in a similar situation, though younger, and it's especially weird in our family because my dad grew a full extra tooth near the front for no apparent reason, and his brother regrew all four wisdom teeth after having them extracted, so you'd think my brother would err on the side of too many teeth, not too few!

(We're a bit screwy in general, though. My dad has an extra vertebra, besides the extra tooth, and I managed not to get enough vertebrae, but I have 1.5 extra ribs.)

I’m curious about this too, also having an adult tooth that never developed.

It needs the tooth nucleation point to exist at the moment: it's where the truth starts growing from during development.