Nothing ever stays dead. It looks like Jensen Ackles and his wife are pitching a show called The Winchesters to the CW. They have a script commitment, but no green light yet meaning the project could fail like the other two attempts at a spinoff. From what we know so far, it would focus on the early days of John and Mary where they hunt and save the world. That completely flies in the face of all Supernatural lore, but that's what they're going with.
‘Supernatural’ Prequel ‘The Winchesters’ In Works At The CW From Jensen & Danneel Ackles
‘Supernatural’ Prequel ‘The Winchesters’ In Works At The CW From Jensen & Danneel Ackles