I know that such a proposal sounds like a fantasy, like a pipe dream yet I think it’s worth considering it, at least as an exercise of imagination.
Both WikiData and MusicBrainz contain a lot of data (mainly links) about the artists (discogs, facebook, twitter, itunes, allmusic, spotify, instagram, worldcat etc). And then, to improve consistency, it would be better to have only one database - at WikiData (for the artists having a WikiData entry). And then, replicate the database at MusicBrainz, say once per month.
It would save a lot of time, since the users won’t introduce the links twice.
Some might say that the vandalism at WikiData would propagate at MusicBrainz. But that won’t be an extra vandalism, since the vandalism at MusicBrainz would not exist anymore. The vandalism at MusicBrainz will be simply replaced with the vandalism at WikiData - which is pretty much the same thing. So it won’t be an additional, increased vandalism, but it will be just a replacement - it will only change the location where the vandalism takes place.
In fact, the vandalism would be reduced, because it would take place only in one location (WikiData). At this moment, the vandalism takes place in both locations (WikiData and MusicBrainz).