While Pai and the FCC will do whatever they can to repeal Net Neutrality, the FCC operates with well defined stipulations. Once the FCC repeals Net Neutrality, it will be sued. And when it is sued, the burden will be on the FCC to prove that they had good reason to repeal Net Neutrality. That is why these public comments are so important, not because of Pai's actions, but because of the court case that will follow. If the prosecutors can show that the FCC did not act within the best interest of consumers, there is a very good chance that Net Neutrality will remain law.
Congressman Don Beyer did a very helpful town hall on the subject along with former Chairman Wheeler and former FCC General Counsel Jon Sallet: https://www.facebook.com/RepDonBeyer/videos/1940174359562352... (the video is long but very informative).