4x21 Harry Wells Leaves

Theory
In the synopsis of episode 21 of season 4, otherwise known as "Harry and the Harrisons", we were told that Harry Wells is going to be kicked out by the Council of Wells and that Cisco Ramon, otherwise known as Vibe, is going to make a new him council: the Council of Harrisons. The in the trailer of the episode we saw that the members of the Council of Harrisons were all also kicked out of the Council of Wells.

Leaving Team Flash
Since the other members of the Council of Harrisons were all also kicked out of the Council of Wells you'd have to think that they aren't the brightest minds either. If this is true they probably can't help Harry get his intelligence back. Because of this failure he might feel powerless and he might also feel like he can't help so eventually he leaves Team Flash. I do hope if he leaves, a new version of Harrison Wells comes or maybe even Marlize DeVoe stays.

Verdict
Harry didn't leave Team Flash after he met with the Council of Harrrisons in episode 21 of season 4, otherwise known as "Harry and the Harrisons". Which hereby debunks my theory.