For the users sakes, I think its acceptable to require the author to at least bump the toc for every major content patch (ie. again at 6.1). Doing that every 6 month shouldn't be too much to ask, and it sends a clear sign that its still working.
You do not have 103 addons with your name on them. I abandoned expansion TOC updates many, many expansions ago. Like I said before, I'd be happy to confirm that my addons are still working before an expansion if that meant you guys didn't mass-mark them as inactive.