If the petition passes, then the guys at the White House will take it in consideration. Then they require proof, which is harder to obtain. Just because of what the petition says, regarding what kind of person he his and what he did till now, there is no proof to actually arrest him. More than that, it would be almost impossible to actually start an investigation, when you have so many obstacles - elites, well paid lawyers with good reputation, judges etc. He is controlling a lot of things.
My opinion is that this petition is a tryout/scream to the people, but the rest is just impossible crap.