You never know, he could be visited by an alien that gives him the power of immortality, we don’t know what’s out there

He would need to find a new solar system as well

Assuming science and tech improve exponentially, why wouldn't this happen within a century? Unless phenomenon appear that violate our understandings of physics, neuroscience seems on track. If Musk (or others) can get adoption of even simple consumer devices, it's going to be an arms race.

> Assuming science and tech improve exponentially

That's a pretty big assumption to make. Science and tech seem to improve as a direct function of energy available, and in the past few centuries that has been increasing very rapidly (I'm not sure I'd say exponentially though). However we're clearly hitting limits both in regard to human more energy we can harvest as rapidly and the consequences of unsustainable energy usage.

> upgradable

How human would I be then?

Ideally? As human as you want, whatever that may mean. Not as human as you're forced to be, or as inhuman as the economy or social forces push you to be...

There are many and varied problems we'll be facing. I just don't think "Immortality without any of the supporting technologies" is one of them.