I was completely shell shocked when A Double won... but, I really shouldn't have been for two reasons:
Firstly, as mentioned already, this has set a precedent that the X-Division Champion can become World Champion because of 'Option C'.
Secondly and I'm more than slightly surprised that this hasn't been mentioned yet but a heel faction is about to invade the Impact Zone and them going after a heel World Champion just wouldn't garner the same response from the audience.
BFG is a good distance off and the 'Aces & Eights' are going to make their motives known well before then. Taking it that the BFG Series competitors have bigger fish to fry (winning the tournament), this leaves Sting, A Double and, possibly, Abyss as the big name faces to fight the good fight. Also, as the 'Leader of the Selfish Generation', guess who is likely to gain from an association with the interlopers and will probably regain his belt at some point before BFG
.
Bobby winning last Sunday night would have only left him a returning Sting (who'd have his hands full with the A&Es), Abyss and possibly A Double to keep him busy and I think the audience would have ruled out any possibilities of him losing this side of BFG.
DX's events and the potential ramifications of an invasion shuffle the deck nicely.
One point I'd like to address:
While Bobby Roode did win several matches by nefarious methods, he still defeated luminaries like Mr Anderson, RVD (in a ladder match, no less), Sting and AJ without resorting to cheating.