Probably medical technology or a drug compound that will keep us young virtually forever.
Who is this “us” of which you speak, consumer? Such advances will be reserved for the deserving. We can’t have consumers living forever, world population would skyrocket and what about medical profit centers such as cancer and aging? Oh no, can’t have that, too disruptive. That’ll be reserved for government officials and other wealthy persons of the correct idealogy.
I'd like to test that. I'll take all the losses through time.