Did the false teachers finally succeed in turning the Galatians away from Paul?
Yes, the perverters evidently succeeded. All in Asia, including Galatia, had turned against Paul, which is why he had to write to Timothy. The Judaizers' influence with circumcision and law keeping pulled the Galatians from Paul's pure Gospel of Grace.
Les explains that the Galatians were beginning to believe the Judaizers, who demanded circumcision and law keeping over against Paul's pure Gospel of Grace. Paul marveled that they were so soon removed from Him who called them into the grace of Christ. The false teachers came in like ravening wolves whenever Paul was absent, tearing the congregations apart. Although the perverters finally succeeded evidently—otherwise Paul would not have had to write to Timothy—Les notes that all in Asia, including Galatia, had turned against him. He then turns to Galatians chapter 4 to show how Paul miraculously uses the Scriptures to teach a lesson, hoping that if the Galatians did not catch it, we will.