It is true that nobody can tell you what Apple might do in the future. We couldn't tell you what they might do today!
That said, here are my thoughts on the matter, for what it's worth.
Even if Apple were to make improvements to iTunes Match, the kind that might result in better matches of the sort you describe, the chances they would decide to re-scan millions of user's libraries and make mass changes to them without their expressed consent would be pretty slim. I can't envision a scenario where Apple's could make such changes without risking matching material that some users really would prefer to keep as uploads. And yes, there are people who really want more stuff to upload, not the other way around.
It is more likely that Apple would alert people to the fact that going forward, a new, improved iTunes Match will do a better job. I suppose they might give users a way to opt-in, though the server load would be crushing as the whole world pushed the "re-match" button. Thing about how bogged down things got during the roll-out and not everybody bought iTunes Match the same day - it wasn't even rolled out everywhere the same day.
Users who wanted to go through a re-mach would probably be left to do what is being done now - remove uploaded tracks from their library and the cloud, load them back into the cloud and run match again.
With effort, you can search this support site and figure out that a lot of people have this problem, but that nobody really knows why it's happening and thus if something can be done to mitigate the problem.
Hypothetical sources of the problem are:
- the artist decided to replace/remaster one track on the album so that all but one track match
- the artist replaced all tracks on the album, where most are sufficiently similar that they still match, but some do not
- Apple's matching software is less than perfect and thus hyptothetically could be improved so that a greater percentage of songs that should match actually do match
17% of my 600 or so albums (about 8% of my songs) have the partial match problem. I've gone back and forth with Apple support on this. Apple support has been annoyingly evasive, saying only that (1) could be the source of the problem and that would be out of their control, and therefore they will consider any failure-to-match as "expected behaviour" and thus will do nothing to address the issue. They've been very careful not to conceed that (3) is a possibility -- ie. that there is something they could do to mitigate the problem. I think everybody knows (3) is part of the problem and Apple's refusal to acknowledge this, IMHO, makes them look bad.
"regretfully, the investigation team has confirmed that some select songs may not be available to match the content within the iTunes Store and unfortunately that cannot be changed as content is edited frequently within the store at producers discretion. This is beyond our control and we cannot always guarantee that using the iTunes Store or our programs will occur without some issues, such as these." (sic) - Apple support