I'm afraid I'm being stupid here, but I have no idea what you mean when you talk about "the process doing its thing through to the bitter end"
As things stand, in paper the university will accept the students back next year if they arrive. They have said they will not return: that is, presumably, not binding on them. Things might calm down. People forget. Then they can turn up with the letter saying "one year ban", re-enrol, and the whole dispute starts again.
What should have happened is that if the university wants rid of these students, they should have expelled them. Once they are expelled, they cannot re-enrol. They then have various routes of appeal, but they would have to win one of those appeals. No win, no enrol. Under the circumstances I think it unlikely they could win, but I might be wrong.
So the problem is "what can the students do now, in the absence of new hearings". Had they been expelled, they could do nothing. in the current situation, they can re-enrol when their formal ban/suspension expires, and there is nothing formally the university can do about it.
Hence why I say it's unsatisfactory. At the moment, the only reason they aren't coming back is because they have said they aren't coming back. They might change their mind.