do you think there will be a season 7?

i found out that SPN was only suppose to have 5 seasons and i am aware we are only in the middle of S6 but i want ti know. i want there to be more but how long can they stretch the plot and everything. but if season 6 goes well i hope there is a S7 or a great eneding ( no matter what happens i know i'm going to cry! because its ending )