I don't think anyone has any problem with the 'model' as explained by the directors downwards. However, owning your own players with a view to making a profit from their development depends on selecting the right players at source, and that is where some have questioned the results of the programme to date.
The loan system has developed for very good reasons: clubs have far bigger squads than at any time in the past and need to develop young players by giving them game time at the correct level for current ability - look at Freddie Draper, for example; the borrowing club benefits through (hopefully) having the services of a player with more ability than they could have afforded otherwise (for example, as we did through Brennan Johnson).
Therefore, choosing to own your players instead of using the loan system is always going to be more expensive, hence the losses and need for more investment each season. At some point (certainly within the foreseeable future), we will have to sell on a player for very good money to justify the strategy and the jobs of those in charge of recruitment. The problem is, who is that going to be?