What I find troubling is when people decide to move into a new area and they consider school districts, cultural entertainments, the availability of outdoor activities, etc., but don't consider the "church scene" at all.
At the same time, employment, family, friends, etc., need to factor in as well.
I recall that Paul never advised the "good" Christians in Corinth to leave and move to a city with a more healthy church, nor did he do so in regards to the region of Galatia. Nor does Jesus do so in regards to the churches in Revelation, etc.
I'd liken it more to what Paul says about the case of slaves - if you can get your freedom, great. If not, be a good slave. If you can responsibily move to an area with a better church, great. If not, then "grow where you're planted."