I think you are right. We will not observe QI agents and it is a bad policy to recommend it as I will end in empty world soon. Now caveats.
My measure declines because of branching anyway very quickly, so no problem.
There is an idea of civilization-level quantum suicide by Paul Almond. In that case, the whole civilization performs QI coin trick, and no problem with empty world—but can explain Fermi paradox.
QI make sense from first-person perspective, but not from third.
I think you are right. We will not observe QI agents and it is a bad policy to recommend it as I will end in empty world soon. Now caveats. My measure declines because of branching anyway very quickly, so no problem. There is an idea of civilization-level quantum suicide by Paul Almond. In that case, the whole civilization performs QI coin trick, and no problem with empty world—but can explain Fermi paradox. QI make sense from first-person perspective, but not from third.