Is Supernatural Getting Excessive?

For the past 6 years now there has been a hit TV series from America called Supernatural. I have been a fan  for 4 years though.

The plot is 2 brother's hunting monsters, ghosts and demons and is now on it's 6th season. But should they stop at season 6 or should they develop it further. To be honest I think it will end up being like a soap themed thing or just be as confusing as Lost, so I say no. But if you have an opinion please say.