Personally I'd be happy if Timberland is working on some MJ music because he knows how to produce a hit.
I know that will go against the grain in the MJ fan community but that's the way it is.
Mj's untouched and uncompleted music will never produce hit records or future commercial success for MJ in their current form. They need to be reworked to make them more appealing to the wider audience.
Some fans don't want commercial appeal. They don't want chart success. They don't want anybody to touch the material left by MJ. BUT the MJ Estate is here to make money and MJ loved chart success. I'm sure he would agree with any new album or single that put him at the top of the charts, especially if they became MASSIVE (i.e. successful for longer than a few weeks).
The incorporation of Bieber onto STTR is questionnable considering there were seemingly complete MJ vocals to work with, but the production of that song had to change to make it hit-worthy. Many fans liked the 2010 version produced by Tricky, and that was almost certainly much different to the version MJ worked on.
Some people only want people who worked with MJ to work on his unreleased material, but that may be a red herring. Sure, MJ may have worked with Teddy Riley and others in the past but they may not finish a song in the way MJ would have liked.
The Estate need to find the right producers and not limit themselves to the ones MJ worked with.
TImberland may have criticised MJ's later music, and many many people would agree with him, but that doesn't mean that he's a bad choice. In fact, it could mean he's a good choice. Many people around the world believe that MJ's best albums were those produced by Quincy. Personally, even though my favourite albums are Dangerous and HISTory, I had wanted MJ to go back to that Off The Wall sound to recapture some of that magic that sucked people in in the late 70s and early 80s. I wanted Vince to be more like OTW, and was hoping the same for any future album. In my head I know that wouldn't have happened because (IMO) MJ lost his way, but if Timberland can produce something that sounds a little like Off The Wall then the album could be huge. It's a very cool sound right now. Even if his material doesn't sound like OTW he has the ability to create something that will be played by radio.
MJ fans need to stop trying to destroy future MJ products IMO.
They claim to be protecting MJ's legacy but MJ loved success. MJ would have loved the idea of posthumous albums selling millions upon millions and being number 1 around the world. To think otherwise is ridiculous.