they sould "Have one more film with the Next Generation cast and then have Captain Riker take over"
It would provied a nice transiten into a new season.
Maybe he could take over in the middle of the episode after the caption dies in a tragic accident on board the Enterprise or on a mission.
A majority of the plot could focus on him getting used to his new duties as caption while dealing with the job at hand.
Yes I do have to much free time to thnk about these things, the mind of a hopful writter must alway have a lot of free time