The nine tails is going to get out for god sakes naruto has a very powerful evil organization after him that is trying to release it. As for not being able to beat the nine tails we have to remember that if he does fight it, it wont be for a while and maybe by then he would have gone off and created his own secret move like the fourth did that absolutely dominates. Power levels become shady when they start to fight for people they care about too so if Naruto was fighting for the village and they finally cared about him he might just go ape shit and become Level 4 super Naruto.