People are assuming this interview was already scheduled. It's very possible they just called after the loss took place. Like someone else said, the agent does 99% of work. We'll never know. Also, the fact that you can have 4 in one day or 6 over a weekend, goes to show that you don't really need to prepare that much. It's not like the team is expecting a full team analysis/strategy on the first phone call. I bet its more about your vision, values, and connections. I highly doubt the interview had any effect at all on the game plan or execution.
While there were certainly times this season, Sunday included, that his play calling was frustrating, just be weary of the "grass is always greener" mindset. Someone said, "you can't do worse...". FALSE! Oh you can definitely always do worse. Talent or not, a coordinator is the conductor of the orchestra and you can certainly waste talent (look at our defense for a recent example). If Art does get hired, can we do better with someone else? Maybe. I hope so, but it certainly isn't a guarantee. We could do much worse than having him stick around for another year.