If we lose Taupau we still have a pretty good prop rotation. Paseka, Aloiai, Sipley, Keppie, Davey are all current squad players who are playing prop or can play prop. Then we have Fainu, Saddler, Tu'itavake all coming through. It's likely that Fainu and Saddler both come into the thirty for 2022.
I think there is a reasonable chance that we pick up Bullemore, but obviously it's far from a done deal. That gives us eight props in the main squad and one in the development squad. Nine in total.
Yes we do lose a lot of experience if Marty leaves. Obviously Utoikamanu would be a fantastic pickup but it's highly unlikely that the Tigers will be happy to let him go. I also don't think we need Thompson, Klemmer or Woods. I would really prefer that we work with what we have (plus Bullemore if we do that deal), and the props we have coming through.