I can't say I disagree with any of this. The time for this to be a sustainable winning organization is running short, so it's imperative for the farm system to begin producing high quality inexpensive replacements within the next few years. The expensive rotation is one of the primary reasons I'd be very hesitant to trade Tiedemann and even Manoah, given the fact that the team simply can't sustain paying $100 million per season on the rotation alone, especially with the upcoming decisions to be made with regards to long term contracts pertaining to Bo and Vlad.
I think with the upcoming emergence of the likes of Barger, Rodon, Martinez and Tiedemann, who each have a shot to be above average MLB regulars in my view, that sustainable winning is still a possibility but far from a given.