In this scenario, where Sheets and Stiever prove they are mlb talents, I dont think it is necessary to trade everyone who doesn't have a set in stone spot in the MLB lineup. Good organizations have depth and legit MLB talents stuck in AAA because they are blocked. Every team suffers injuries and having solid players to fill in for them is huge.
I just think its shortsighted to just say ok all the spots are filled, trade everyone else who could be an MLB contributer. Having too many good players is a good thing