That's unlikely, but I do think that the health benefits of full sequence testing yourself are largely hypothetical at this point anyway. Unless you're a competitive athlete maybe?
Everybody is a carrier of several genetic disorders, I haven't not seen a single person without that. If somebody doesn't like to know, let them be.
Unfortunately you’d have no power to correct it. Even if such a thing were possible. I hope that changes.
Are you talking about time travel? I don't think that would help.
More like genome editing.
You have no power to correct something with gene editing, true, but there may potentially be preventive action you can take. It's all largely hypothetical today anyway, most things you care about (e.g. cancer, Alzheimer's) you can't usually tell very reliably if you're going to get from a DNA test.