Your argument was centered around the idea that you don't understand the support for build from within. What is your proposal then? Ship all these prospects out for veterans?
Before any of those established Red Sox players were successful major leaguers they were questionable prospects.
I don't think the core is that far away. Hell Rubby has already had success in the majors, assuming he heals properly I think he either makes the major league roster in April or is there very soon.
As for Webster, his command isn't great but neither was Jon Lesters. Stuff if far more important, a lot of young pitchers are wild to begin their careers and then settle in. Buchholz pitched 8 starts before getting the call to the majors, if Webster has a good start in AAA and there's an opening he's a potential mid-season callup.
As for Bogaerts and Bradley, they have already had success in AA. If their first 100+ AB look good I don't think the FO will hesitate to promote them. WMB had 100 AB in AAA before establishing himself as a major league regular, these promotions can happen very quickly.