You're probably right but then again if Quinn is taking the interview I'd assume he has some level of interest.
He's taken a bunch of interviews the last two years and nothing materialized, he might have a bit more urgency to jump this year because he might sense opportunities drying up, but we'll see.
I think the biggest thing is whatever happens with the Seahawks, Patriots and Titans jobs over the next few days. If Carroll, Belichick and Vrabel all stay, or even if 2/3 stay (assuming one is Carroll), I just don't see many strong possibilities for him.
In that case you'd have Washington, Atlanta, Carolina, Chargers, Raiders, and maybe the Titans open?
No real obvious fits there, and if Vrabel or Belichick are let go there's a decent chance they end up hired as HC's at one of the other openings to begin with.
Seattle has always been the biggest threat, if Carroll remains there I think there's at least a 50/50 chance Quinn stays, and probably closer to 70%.