Spoilers: Conjunction of the Spheres

As we all know, the reason for all kinds of monsters being in Geralt's world, was the conjunction of the spheres, during which they ended up there.

During all 3 Witcher games there was usually a strong emphasis on Witchers being an anachronism - on their time coming to an end. On monsters being almost wiped out, so that no one would still need Witchers.

Spoilers: During the ending of the game, Avallach initiates a new conjunction of the spheres and there were even new monsters showing up during the whole event. Wouldn't this renew the need for Witchers? Or was this conjunction of the spheres somehow limited to this one island in Skellige?

They don't really mention/explain it anymore during the ending slides, so as far as I'm concerned it remained unclear.

So, is the whole world now facing a resurgence of monsters, or was is only a minor event on Undvik?

Thoughts?