I think they get another comedy director and finish the movie and release in Diwali 2019.
maybe even Sajid Nadiadwala can step in. or they can get Anees Bazmee. if they get Priyadarshan, the entire tone will change, but it would be amazing.
there is a chance however that due to all this controversy and delays, it might not release on Diwali, but there's still a year to go, they might make it in time.