of interest:
https://www.rollingstone.com/music/m...-petty-724996/
Campbell talks about the plans for Heartbreakers to tour with different singers in Tom's place, following up by possibly recording new material with some other songwriters (hmmm, Nicks maybe?) and tour that new Heartbreakers material. so doesn't sound like there's much plan for MC with FM after the currently booked tour is over. and any new material MC would work on seems pretty clear would not be FM.