Awe "Tight End" my favorite position!
The run game has become less a factor in determining Super Bowl champion. In the last 11 years only two times has a team finished in the top 10 in ypc (NO and NYG in 07). And only 4 times has the SB champ been in the top 12 in rushing yards per game. Last year's SB champs, NYG, were dead last in both ypc and ypg. Having said that I think both SF and Baltimore incorporate the run game and use it to set up the pass game.
What should Miami do with Long? The Long of this year is not worth top $$$. Resigning him will significantly take a chunk out of the salary cap. But when healthy hard to argue he is a liability being on the roster.