leave them alone? why meddle with other teams? as long as they don't start dropping players left and right there is no real problem.
Don't invite the owners back for next year -- that's the most reasonable thing you can do.
Give a man a fish and he'll eat for a day, teach a man to fish and he'll drown because you forgot to teach him to swim.
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This happens. Just leave them alone. It's such a bummer, though... especially when those teams have guys you want to make trades for.
Like was said above, if you fear they may dump at some point, freeze the rosters. If not, just leave them alone... you can't edit their rosters b/c it would be unfair to those who have to play them after that point.
I wouldn't be too quick about locking teams. I remember a very good owner in one of my leagues once did nada for two months, simply because that was what his strategy dictated (and he wasn't being hit by injuries, obviously). I think he finished second that year...