They will definitely be moving to FB. UX also had their own (extremely lousy I may add!) FFP before joining as an associate and at the same time converting to FB.
I think the original plan had been for AZ to sponsor RO, but with the current situation this would obviously not be a solid long-term bet, and I can't see OK being interested in committing any resources to such a project after Malev turned against them and defected to OW, so AF decided to take it into their own hands.
I expect Smart Miles Super members (all five of them) will be thrilled to welcome FB and the resultant loss of their space-available upgrades!