There's a bit more to the story.
Jason Mewes, otherwise know as Jay, had been dealing with quite a heroin problem. As a part of deal with Jason, Kevin promised that if Jason could get clean, he would write another Jay and Silent Bob movie for Jason (since Kevin was stepping away from the traditional Askew-niverse, there would a mimimum of opportunities to work with Kevin). Jason got clean. Kevin wrote a sequel to Clerks since he also wanted to return to something comfortable. Plus, he felt he had a little bit more to tell about Dante and Randall, especially after Clerks the cartoon was cancelled.
In any case, I'm looking forward to the new movie from Kevin since he's a pretty keen fellow.