While I agree, the Lions are one of the up and coming teams in the NFL... and I like them ALOT to go far this season... theres alot of variables. 1st of all.. if Stafford gets hurt, their season is sunk... again. And they'll probably look for or draft a QB who is more reliable.
2nd... If the Lions have any hope for a super bowl, they're gonna have to go through the Eagles (Michael Vick) and the Packers (Aaron Rodgers). The Lions are VERY good, especially on their defensive line, but can they overcome the offensive firepower of the Eagles and Packers? Also, their secondary and defensive backs are suspect... which might be a huge problem.
Overall, I like the Lions alot, and this may be their breakout year, but at best I think they might sneak into the playoffs and lose in the first round. Just not ready yet unless a miracle happens haha.