If you don't believe he'll find a way to get a third term like every other dictator, you're living in a fantasy.
He knows without presidential immunity he risks prison. And he has previous for trying to steal an election.
I have no doubt he'll see to it that he never faces the risk of prison, and this is the most obvious way to go. That and he's clearly a power hungry megalomaniac.
I think it'd be more informative to ask why he wouldn't try to get this.