I can agree for some parts with the release of the rest of the cascio songs making "more(?)" fans mad, but I think a song like Burn Tonight released in the Summer would definitely be a smash hit/club hit. It's got so much dance and rhythm in it and it's incredibly catchy so I would really hate the fact if they never released that one. Same goes for songs like Black Widow (of which, yes sony, I heard more than the leaked part) that really are awesome tracks if finished, in my opinion. It could be "MJ's" last rock song for all we know.
Same goes for All Right, Stay, All I Need, Water and Ready 2 Win. All are very nice songs.
The ones I could agree with NOT to release (because of what I heard I think it's too incomplete, so not the vocal issue) are Fall In Love and Soldier Boy. They just aren't finished/good enough to be put on an album.
So yeah, in short, more cascio releases could make more fans mad, but at the same time it could make other fans, like me, very happy. =)