I think trying to make a club sustainable off transfer fees is a bad idea anyway, and I would be concerned if it was a serious part of the business plan. No Scottish club has been able to make a go of it for more than a few years at a time. Back when the Raes were in charge there was a 'dodgy dossier' of how Falkirk and Accies were rolling in it; even if we, without the benefit of an elite academy, were somehow going to replicate that, it was far from clear that it would actually many any of the three clubs sustainable, rather than the cost center eating its own lunch and our just spending money on players when we had any (like Falkirk and Accies did.)
My belief is that the only way to run a club sustainably is through year-round, non-footballing revenue, which is to say that I don't think you can run a club sustainably, because if it was sustainable the revenue would be sporting, rather than subsidized by completely unrelated stuff like offices.
Whether or not we play youth players is completely immaterial to me, but I do accept that if the club really does have designs of being a selling club of young players, the current trajectory is not encouraging. I would, if I were them, take that opportunity to recognize that we can be reasonably successful on the pitch and make decent prize money without young players, and given that prize money exists every year, that is perhaps a more reasonable path to sustainability than gambling on transfer fees that so far have not materialized for us.