We are fast approaching a time when all houses have pex. At this point we've been using it in new construction for decades, and most houses with original galvanized pipes are either already replaced with pex, or getting really close.

I'll be honest, I also am not enthusiastic about drinking the volatile organics that hot water leaches out of polyethylene piping.

Give me copper or give me death.

I think you are vastly underestimating the age of the average house.