Maybe a crazy idea, but...if... And it's a massive if.. Phil feels up for more shows in 2022 (ie to fulfil Europe) ... Then IMO if it really is the final curtain on genesis' illustrious career, then why not go out with a big bang... One final massive show at knebworth or Hyde park (like Paul Simon few years ago)... In any case I guess it would likely be same show as currently .. but one can dream that a one song cameo for each of Peter, Steve and even Anthony as an encore?!??. That would be a fitting finale and would close the book on any expectations of Pete and Steve in particular rejoining the band in a more significant role.
One can dream!!!!