The reason I haven't commented on this topic so far is because - as some already noted - something very debated already. In short, it is our aim to have higher levels congregate more around the Mist Camp and non-Barovian areas.
To the extend that it's possible, we prefer doing this mainly by encouragement - but also in a way that makes good sense IC. The Mist Camp is catching pace in terms of activity (and thank you to those who've done an effort to support that) but development wise, we also have several on going projects that are intended to increase the appeal of the high level zones and make them better suited for permanent residence so people don't have to return to Vallaki for certain things.