I think you can't replace Freddie either, and it is pointless to try, but you might be able to recreate the magic with the right person and perhaps come up with something very good. Adam is the only singer I've seen who might be able to pull it off. Not Freddie, but exotic and exciting. Unbelievable voice. To try it is not our choice but that of Brian, Roger and Adam, but I vote "go for it".
Everyone thinks his own fleas are gazelles.