This question is inspired by this excellent question. It asks to revisit a feature request that was denied by co-founder Jeff Atwood from 2010. The feature request has a positive score of 142, Jeff Atwood's somewhat cryptic reason for his decision has a negative score of 36.
I propose here to revisit Allow an edit to notify downvoters: "I think I've fixed the issue now - please check" and Jeff Atwood's decision to deny a feature that would allow downvoters to get notified once the downvoted contribution has been edited. All the arguments are in the question and several of the highly upvoted answers. There's various possible implementations, some of which apparently both introduce little noise for users and are easy to implement (like this one).
The proposal has a whopping 774 upvotes, Jeff Atwood's explanation for denying the request has 71 downvotes. Of course this doesn't mean it has to happen, but as far as I can see there's no real technical difficulties to prevent implementing a feature that does what Jon Skeet is asking for:
Jeff Atwood himself calls it "a good idea", and his stance that comment notifications are "close enough" doesn't make a lot of sense to me, since users won't always comment when downvoting, especially when the reason for their downvote has already been stated by another user. (I would just downvote if I agree with the comment without adding another one saying the same thing.)
This would also greatly help users who got question/answer bans and are trying to claw their way out of that - apparently it can be rather tough to get out of one, and I imagine it's not easy to get downvotes to go away when downvoters aren't even aware that the reasons for downvoting have gone away.