Jolly LLB was super hit movie released in 2013. For his performance in the movie Saurabh Shukla got a national award for best supporting actor. The movie had Arshad Warsi as well as Boman Irani in lead role. Latest news is that the shooting of the sequel of the movie has began and Arshad and Boman has been replaced. Arshad's role in the movie has been replaced by Akshay Kumar and news about rest of the crew is not yet available. In an recent interview Arshad was asked about this to which he replied like this, ( The interview was published in Indian Express.com)
I was supposed to do Jolly LLB 2, but Fox Star Studios needed a bigger star, so they chose Akshay. It makes it easier for marketing, it makes it easier to have a hit. With me, you (the filmmakers) have to make a good film, so that is the problem. You can make money with me only if it's a very good film."
If you have a bigger star, then even if the film is not that good, you still manage to cover the money so risk factor from the producer's point of view is less.
Arshad also said that he was the one who convinced Subhash Kapoor to go ahead with Akshay eventhough he was ot willing to.