alt Hacker NewsIt reminds me of this, which talks about this exact scenario:
Tldr is that for some very limited tasks it might still be preferable to use a human mind, especially if you can run it at 1000x cognitive speed. Or.....it might not. It's sci-fi at this point.
It shouldn't remind you of that, my point is there's little economic use for uploads like this: if thinking meat is cheaper than thinking silicon, train some fresh thinking meat with an electrode array or whatever; if thinking silicon is cheaper, train some fresh thinking silicon.
Non-economic use, that's different of course. Digital afterlife and so on, but as a consumer, not a supplier of anything.