I don't know that Nunes is going to charged, but this meeting was an attempt to go over Nunes' head. The FBI was obviously complaining that what Nunes is doing is undermining the agency's work and that Ryan should put a muzzle on him. This business with Nunes demanding that they produce documents related to internal investigation procedures, which information could/would then be selectively leaked to the public, or totally leaked to Trump, is beyond the pale. They are clearly at their wit's end with Nunes' behavior or they wouldn't be doing this.
It seems like it would be really difficult to charge Nunes with any crime as congressmen are immune from the law while discharging their official duties.
That being said, Nunes’s behavior has been absolutely unconscionable during this entire affair and it certainly deserves an ethics inquiry.