I think most people would reasonably assume an ancient question for a game that's constantly updated is out-of-date. That is, if you've played Minecraft for more than a minute, or did any amount of searching for the game (here or elsewhere), you expect that a question/page/forum thread that's been inactive for more than a month contains dubious information that needs verification. Unfortunately, that's the inherent risk in covering perpetually updated games and it's why Stack Exchange has wiki-like features.
So it comes down to two classes of questions: the ones that ask about an active feature but produced now-obsolete answers, and ones that ask about a feature that was removed from the game.
In the former, I would hope any bulk action wouldn't affect them: they can be updated to be current by the community.
In the latter, you'd have a few different types of people who would find that question:
People browsing the list of Minecraft questions.
People specifically searching for an obsolete feature for whatever reason. They may just be interested in the history of Minecraft, or a person who hasn't updated Minecraft in a while and in for a rude surprise when they do
People searching about a related, active feature. Like, perhaps, a person interested in how to speed up their minecarts (powered rail vs. booster track)
The first group has no defined goal to cater towards, and can be ignored for the purposes of this issue.
The second group would be unhappy if there was no information, and are reason enough not to delete the questions.
And it's the third group that would cause the most confusion. In order to handle that confusion, questions should be closed as too localized without further action in obvious cases of obsolescence. The reason the question is closed as too localized should be obvious to any player for the reasons I mentioned above.
But otherwise, if a question hasn't gotten any activity in a while, let it be: there's no need to proactively take action on all possibly obsolete questions as it only increases the chance for human error that a question gets closed for the wrong reasons (i.e. a moderator thinks a question is obsolete, but after 8 minor patches, the feature the question discusses is back).
But if a question is getting activity due to misguided attempts to point out it's obsolete (like someone leaving a "This was removed in 1.6" non-answer), close them as too localized and add a moderator note as per the previous consensus.