I doubt very much that will ever happen. Hosts have been asking for this for years, but Airbnb seems to have always ignored that suggestion.
There was once an indication that they were serious about removing 'outlier' reviews, but that just turned out to be smoke and mirrors. The outcome (don't know if this still exists) was that a guest would get a pop up asking them 'are you sure?" if they left 5* in every category and 1 or 2* overall. I mean really??? How many cases would that apply to?
My guess is that Airbnb does not want a bunch of guests getting irate for having their review removed. If every host could remove one, that would add up to a lot of reviews removed/guests antagonised.