You're saying Seahawks/Broncos is less interesting than Seahawks/Patriots? Not a huge difference IMO. I don't like repeat performances, so not a fan of Seattle going again and there isn't a single team I wouldn't swap out the Patriots for. Maybe Oakland? Hopefully next year we'll get some new blood in the mix.
I wouldn't count on too much new blood in the mix. All the parity that the NFL tried to establish with the salary cap went right out the windows when fantasy football took over and the league started favoring rules that promoted scoring and quarterbacks. Now you either have a really good or great one, or you suck and are looking for a really great one.
We'll get new blood soon enough, but it's probably more of a 3 year window when Brady, Brees, and Manning are all done. And even then it won't change too much year to year until someone starts making it harder on the QB's.