A lot of that post is pure opinion, especially concerning "right direction". If Tim Cain and Chris Taylor came out and said that they didn't consider Fallout 3 canon I'd side with them, as they're the original creators of Fallout and thus I believe that their opinion outweighs Bethesda's. Bethesda may have bought the license, but they certainly didn't create it so their word isn't worth as much as the folks who actually created the universe you've fallen in love with. That's my two cents, anyway.
THat would be your Fanon though. Canon is now Bethesda's [censored].
That won't stop people from considering it non-canon if Chris Taylor and Tim Cain come out and say that they don't consider it as such.
That would be their fanon though.