Continuation of a franchise

This afternoon i was Playing Red Dead Redemption & wondering if they will come out with a follow up, a third part to the series(not including the downloadable one), if so do you think it would work. Also should they have the same main characters or different such as DR1 (Frank West) & DR2 (Chuck Greene) or Red Dead Revolver (Red Harlow) & Red Dead Redemption (John Marston).