most current aircraft will probably not be backwards compatible to single pilot ops and certainly not autonomous. Even if (and that’s a big if) there is a product in the next decade that can be flown single pilot, the hundreds of current aircraft being delivered now and in the near future will still need two pilots for a long time.
I think it is far more likely they will skip single pilot and go straight to autonomous, and I just can’t see that happening for a long time.