I think it'd be a great addition to have the 2nd level, but I see a few problems which may or may not be a big deal.
1) thread topics change and although they may not like initial thread topic, it might change and they'll miss out
2) having an "opt-out of this thread" link would mean I'd be clicking on about 100 of those a day for my list which would be a real pain - having to pull up the forum just to confirm that I was opted out of that thread is almost as bad as just deleting them
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