Buchholz was so long ago, just the thought of your point made, here, should have been the impetus for some major changes.
I've been fine with drafting and signing IFA everyday players over pitchers, if they are the higher odds on players to add, but at some point, the idea should be to trade some for young and controllable pitchers.
I've been fine with overpaying for FA pitchers, despite the fact that many never seem to come very close to expectations, but we kept trying and trying. Since Price and Sale, I would not call it "trying."
Now, back to your point, for a while, this spring, it looked like Houck might end up taking the lead over Buch. Buch was a pretty awesome pitcher and had some incredible long stretches of great pitching. His ERA- of 42 in just over a 100 IP in 2013 was one of MLB's all time best. His issue was never going over 190 IP, going over 175 just once and over 150 IP just 3 times. Houck has yet to top 130, so he may never beat Buch in even his weak area.
Others that have been okay to good:
Crawford
Bello
and cricketts...
Who are our best hopes? (Yikes!)
E R-C?
Dobbins?
Early?
Portes?
Valera?
Mullins, Monegro, Paez, Wehunt, D Reyes?
Maybe a recent draftee?