Some of these reasons are better than others, I think. E.g., no. 5 sounds pretty weak to me. If we can imagine a magical technology that does everything else required, I don't see how the absence of an ordinary mammalian body will make all the difference. Once we get to the desired magic-technology point, emulation of bodily experience in cyberspace or in some sort of advanced robot body is fairly easy to imagine.
And I don't find this sample very convincing:
Without frequent physical backups, refreshes, and format updates, precious data will quickly be rendered unreadable or inaccessible. So when we're all "in the cloud," who's gonna be down on the ground doing all that real-world maintenance — robots? Morlocks? Even if that works, it just seems evolutionarily unwise to swap one faulty physical substrate (albeit one that has been honed for millions of years, runs on sugar and water, and lasts nearly a century) for another one that can barely make it from one Olympic season to the next, even with permanent air-conditioning.
Well, yes, but it's easy enough to imagine our robot or Morlock slaves doing the work concerned, or perhaps we'll be those robots. And if we accept everything else - the required super technology, an appropriate conception of personal survival, and so on - it's not a matter of swapping one faulty technology for just another faulty technology. Once we get to that point, it's not so hard to accept the idea of a technological substrate that lasts a lot longer than our current 80 to 100 years (or a lot less if things don't go well). All in all, the fifth reason just doesn't stand up to inspection.
Oh, and the author, or perhaps just the illustrator, obviously has no understanding of who Krang is. That's unforgivable!
All that said, I'm a bit of a sceptic about these mind-uploading scenarios ...
I agree that our understanding of human consciousness and how it supervenes on brain activity is at a primitive stage, and there's no sign that it's improving at the rate needed. The lack of sufficiently powerful hardware is not the real issue: the deepest problems would remain even if we had infinite computing power available. Combine our poor understanding of consciousness with issues of personal identity - and what would count as survival if we tried to move our minds from one substrate to another - and I think that much of the discussion that goes on about mind uploading is unrealistic. It's one thing to employ the idea for philosophical thought experiments or as a science-fictional enabling device; it's another to think it's a realistic option within current lifetimes.