I think they must tour Europe in some capacity? Germany, Belgium and Italy in particular were such huge fanbases for the band so tickets would definitely sell well for a continental Europe Last Domino? tour.
There's very little chance of Ray returning. Tony and Mike still shudder about the CAS tour and the lack of US ticket sales so I can't see that.
I also worry that Nic will want to carve out his own career with his own band soon rather than being 'just' the Genesis touring drummer.
Peter is constantly indecisive but one final show/tour or album with the four/five is and always will be the dream!