I hold a different opinion than Vincent on this matter.
Unmerged matches do not go into pergatory; a list of them can be accessed through Find: Pending Merges, then selecting Unmerged Matches. I can find either ALL Unmerged Matches or those that I initiated or that are waiting on me. Just like other merges.
And one can always do as Vincent did-- remove, then re-initiate the merge if it's been sitting around a long time and appears to have no reason to remain an unmerged match. (I also probably disagree with Vincent about reasons for unmerged matches-- if the two profiles have conflicting information and the proposer doesn't help us understand how to resolve those differences, or the narrative and comments aren't otherwise clear, it's completely reasonable to select Unmerged Match...)
I *do* believe that Unmerged Match would be much more useful if we could include reasons for choosing it, just like we do when we propose a merge.
But both of these drums have been beaten repeatedly without resolution of either opinion or tech fix...