If Sanderson and Harriet really are dissatisfied with the way the books turned out, will they publish an alternative version of the books that solves the issues you believe are in the current version after MoL is published? If not a paper-version than an internet version?

I saw that Sanderson put up some discarded drafts of chapters from his Mistborn trilogy on his site.

Personally I don't believe he could have solved these issues to your satisfaction. Published books can only contain so many pages so Robert's original book HAD to be torn to pieces. Of course he could have published them all together divided into a few volumes but the publishers would never have allowed it. It would have cut their profits to a third of what three separate volumes are making. And taking two of the main characters completely out of one of them would have similarly been impossible due to popular demand as well as a major deviation from the norms Jordan set in the rest of the series.