Besides, if everyone is you than isn't that a pale approximation of unending life? I hate it when people either read or think up an interesting philosophy of existence but then become convinced that they know The Truth. If existence is a vast and strange as claimed is it not equally if not infinitely more likely that they have no idea what the hell they're talking about? I mean, no matter how many human lifetimes you traverse you're still just a human. That is, unless your philosophy also involves you being the One True God, which i think devolves into narcissism pretty fast.
I must admit i have found myself wishing that i had been all of them in separate times. It's just so alluring to think i was Einstein and Feynman and Turing and everyone else. I can almost convince myself that i can see enough similarities to make it possible. But that's actually crazy. It's a sensation, a desire. A way of fighting off both the fear of death and the fear that this life won't matter as much as I'd like. After all, who cares, one day I'll be the leader of the free world and i guess also an asshole most likely. It's just a cope for me.
It's also sad that so many purely pull to the authority of physics to justify their personal philosophy. "Quantum" has been butchered by popular media in such a way that everyone just takes it to mean what they want it to mean. Anyways, I'd love to read or hear about your PhD in theoretical physics, I'm about a year away from starting a PhD