Mitsubishi from what it seems have spent a significant amount of time (extensive DD, market research etc.), so there is a large time cost which would sway them from walking away at the drop of a hat.
But yes, the biggest problems for SUD are:
1) Business model hasn't been realised
2) Factoring in a CR in the next year.
Once either of these can be sorted the SP will go for a run.
Artimist trade sale or next milestone payments from TEVA will start this process.
Let's see if we can get both of these sorted in the next quarter.