I know the Niners declined when Singletary was the coach. Probably because he's not only a psycho but a complete moron when it comes to being a head coach.
I'm guessing the Yorks and Harbaugh don't want that sideshow, either, though.
I really like how HBO is "offering" the spot as if it is a privilege for NFL teams to be on this show and not the other way around.
Owners/teams that want attention usually do this shit aka Rex Ryan and the Jets, Lewis and the Bengals, Jerry Jones and the Cowboys, etc.
Why do you think the most well run organizations are never on it any more. There's a reason why Manning and the Colts, Belichick's Pats, the Packers, etc. aren't ever on it. They don't want the extra attention nor do they need it.
So with that said, my money is on the Seahawks.