I have thought about the same thing here and there. I really doubt the 4g63 will become hard to find. look at all the cars that got the motor or a variation of it. Mistu p/u's, hyundai's, the 1g/2g, the 3g has a similer bottom end, then as stated above the JDM motors imported. The idea of dropping a blown motor and throwing another one with little miles may slowly deminish but the block being available and rebuildable will be around like the chevy 350. Future rebuilds may require more work but that is just a natural progress of used motors.
I think the 1g body will become extinct before the motor ever will.
