I think MJ choosing Brad Buxer as his primary collaborator throughout the 2000s didn’t help much as far as artistic evolution goes. I adore Buxer and mean no disrespect, but he has a very specific sound/aesthetic that started to feel dated by the mid-decade. I think Neff-U, Akon, RedOne, and will.i.am were the people MJ should’ve spent more time with. “Hold My Hand,” for example, isn’t a groundbreaking song, but it was undeniably modern and showed that MJ could keep up.
That said, I think it’d highly unlikely that the final versions would resemble the demos. MJ likely would’ve done what he did with “Jam” and “Dangerous,” and have a producer give them a modern facelift. Alas.