I totally agree, but even commercially speaking I think it is important to distinguish between short and long term effects.
-You can release an album full of remixes by today's hottest producers and make a nice amount of money in the short run, but if it does nothing to bolster the perception of MJ as an artist, I don't think this will convert into any sustained increase in sales/fandom in the long run. Opinions on this will vary, but I think Xscape actively hurt the MJ brand. Yes, it might have led to increased exposure among younger generations, but I don't think that benefit outweighed the negative of solely focusing on the remixes (demos were released but on a deluxe edition only, they were poorly mixed and not given any attention during any of the Xscape promo). Michael was presented as a singer, a hitmaker whose own musical ideas do not matter and is dependent on hot external producers to make something worthwhile, and I think that is extremely harmful.
-On the other hand, you can release an album, dvd/blu-ray or box of original material like outtakes, demos, concerts and documentaries that will not make you as much money in the short term because they will not storm the charts, but will make you money in the long run because MJ is presented as a genius artist whose catalogue is worth delving into.
Honestly, a very similar situation happened to Elvis. After he passed, shoddy, quickly thrown together products and cd's with remixes rather than original recordings were released for years. It did nothing for his reputation and, many would say, absolutely harmed it. I probably would have never grown an appreciation for Elvis beyond a very casual level, if it was not for the high quality releases that have come out in more recent years, after his Estate was taken over by people who are actually fans of his work.
And I'm not solely talking about collectors label releases here either. For instance, just last year Sony released an 8 cd, 2 dvd boxset on their main label featuring concerts and rehearsal audio, and both the original and a re-edited version of the concert film That's The Way It Is. They've released similar products in the past, including every bit of behind the scenes footage they could find in raw form, the stuff a fan goes crazy for. So apparently it can be commercially viable enough to release products like that for the masses. The only somewhat comparable thing we have when it comes to MJ is the WATW 25th anniversary dvd, and that of course is not MJ-exclusive.
I know I probably sound like a broken record because I have posted about these things several times, but that's because I really wish the best for MJ and because I know, through examples like this, that it is not just wishful thinking on my part but actually possible and happening with other artists. Seriously, look around and see how the back catalogue and artistry of other musicians, both dead and alive, are being treated. It really is no comparison.