I think the bigger question isn't should they, or will they, but when are they. And who's going to have to sign off on it because it prolly ain't gonna be Branca.
I do think it's important to note that we have yet to reach the 15th anniversary of MJs passing yet, so so far we have had:
This Is It within the 1st year
Michael after 1 year
Cirque De Soleil after 2 years
Bad 25 after 3 years
Xscape after 5 years
This Is It 10th Anniversary after 10 years. And there was supposed to be more (new music) in 2019. But we all know why so much was derailed.
And various other songs, remixes, and other such things throughout the years and months. Thriller 40 last year, celebrating, well, 40 years of Thriller. It came 14 years after MJ died.
So by the time the 15th anniversary rolls around, if they want to be ambitious we'll probably have. The biopic. I imagine the goal is 2024, but I wouldn't expect before 2025. And various other releases to coincide with a significant anniversary every time. And if they decide to, they could wait for the 20th, 25th, or 30th mark, to put out a big box set.