I think we need to chill a bit about the ruck department. We have Sandi next year and we could see him going another year after that possibly. Griff was a good backup to Sandi last year and could still go a couple more years if we need. Apeness is likely to become an even better backup ruck option (ie a better forward) once he's back up and going.
People have forgotten that Clarke did pretty well as a backup to Sandi in the first half of last year as well. But he isn't in the B22 because he isn't up to standard atm. Doesn't mean he couldn't earn his way back in before end of season still. If he leaves, it will probably be because of lack of opportunity, in which case he hasn't performed well enough to break into the B22 even when Sandi is out injured (ie we shouldn't want to keep him) and vice versa. I therefore don't see the issue if he stays or goes at the end of the season.
Clarke, Griff, Hannath, Apeness, Moller were/are probably never going to be satisfactory replacements for Sandi as the #1 ruck no matter what. We'll need to draft/recruit a decent ruck in the next two off-seasons regardless. Maybe one of those giants from America?