Based on the fact that Chad Kennedy said there were no plans to have bisexual characters in SPN, and Jim Michaels said "Destiel" wasn't an intended interpretation and Guy Norman Bee called "Destiel" non-existent... and Jensen has said numerous times that Dean is straight AND Dean himself has said he's straight... you can take "Is Destiel going to become canon in Season 9?" from "Pending" to DEBUNKED? Because that's a preponderance of evidence against Destiel ever being canon.
These are all reasons why we’re in the process of re-evaluating our Destiel prognosis. (Along with a number of other things we’re considering re-evaluating about how we operate now that we’ve been doing this for a little while and have a better understanding of the sort of information people want to hear about!)
Unfortunately, real life happened for pretty much all of our admins at once, and we’re way behind on answering normal asks and rumors—much less an entire essay about Destiel facts and information.
Based on the facts you’ve supplied (and many others), we can 100% debunk any “canon Destiel” in the past, and we can debunk any spoilers that say “they’ve been planning Destiel for the future.” What we do not know is if TPTB will never decide to do so.
The only reason we have not yet debunked Destiel is because the writers and showrunners (and the other people who’ve given statements on the subject, as shown above, do NOT make story decisions) always turn away shipping questions by saying “no spoilers.” (But again, we will post a re-evaluation when we have the time, so we appreciate all of the facts you’ve suggested, we’ll be sure to include all of them!)