The only disagreement I have is the use of "fringe legacy" and "legacy equipment". Most serious photographers I know shoot raw and it will not go away. And I question the 99.9% - reputable reference to substantiate that?
When you consider the number of people who take pictures (on all platforms including point-n-shoot) compared to professional photographers (especially those who shoot RAW) the percentage is probably fairly accurate (let's say 97% just to be accommodating).
If you narrow the focus to just "serious" or "professional" photographers, the percentage is much higher.
I would agree, though, RAW isn't going away, but it's also not mainstream for non-pro photographers.
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I agree there are some who have. However I come back to a very basic statement: For almost all people, if an iPad can replace your laptop/desktop, you very likely didn't need a pc to start with.
Between work, student mentoring, personal, family, friends, peers, and consulting, many have tried to go the "tablet" route. Successes were few. Even those who almost could still found they needed a pc for some things.
I think we can agree that the vast majority of iPad users are NOT black and white but some shade of grey. I don't agree with your basic statement (I think it's too simplistic), but I will say they may not be using the full capacity of a PC (but few, if any, are).