So can you replace an entire unit in one off season? Between average (or less) talent and guys who can't stay healthy, maybe we just replace all five on the o line. That would take care of rounds 1-6 of the draft.
Of course that still leaves WR1, ILB or two, bunch of CBs, speedy RB, more productive TE, and possibly kicker in free agency.
Edited to add: and a special teams coach.
Guy that fills the Gatorade bottle seems OK.