Now, now. This seems a bit...out of context.
I listened to the whole exchange and it didn't sound like he was saying mediocrity is ok. He acknowledged the superiority of the other rotations at the top of the league, but was suggesting "we're not as barren as people think." He highlighted Paxton as a legit #1, which he is. He basically said, "If Felix returns we're golden, if he doesn't, we need help," which is perfectly reasonable considering his $$, etc. He walked through the rotation, highlighting the upside, as he is known to do, locking in 4 rotation slots in the process, but emphasizing the need to always keep a youngin' or two in the rotation for growth...aka, future ace Ariel Miranda ;)
You can disagree with his approach, but I don't think it's fair to suggest his goal is mediocrity.