The show would have been canceled at the end of S3 like he was supposed to. Without Castiel and Crowley and the other beautiful characters we would never have had spn's s4, s5 , s8, s9, and s11 who were the best spn seasons mainly because of the added characters who added depth that spn hadn't in the first three seasons. Without the added characters led by Castiel and Crowley, the show was going to get more and more boring till cancellation, You truly believe spn would have lasted with two whiney brothers hunting ridiculous improbable monsters more than 4 seasons at best? Really? Or are you blinded by your hatred towards Misha that you refuse to see the truth? Kripke himself said that he could finally sleep and stop worrying about cancellation because of Cas and Misha. But sure keep repeating to yourselves that the show was ONLY about the brothers.

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