CW’s ‘Supernatural’ Is Set To End After Season 5, But 

like smallville we kept on hearing this is the last but we kept it going and i am hoping supernatural keeps it up, they can do it if they want and fans need to support

Thankyou for the update. I think as suggested in the article they will try something new with the show, but I can't see them ending it altogether. Hopefully they will give it a rest with the angels and demons and go back to urban legends. The show easily has enough fuel to make it to at least season seven. Although in the seventh season they should end it with the angels and demon theme.