I'm not Super Bowl or bust, but I think if I'm going to have to have a team that sucks for at least 3 or 4 years, the project needs to end with a Super Bowl otherwise, what is the point? And while I thik Super Bowl or bust has to be the goal if you tear it down, at least being a long term contender would be necessary for it to be worth it.
On the other hand, if you maintain a 9 or 10 win team long term waiting for the moment that you do hit on that franchise QB (K.C.) or end up with a great roster that lets you win without a true franchise QB (Philly) then I think it's more okay to miss the ultimate goal because at least you get to enjoy a winning team for the long term.