Sadly I think if this push fails I think thats it for him in terms of getting a legit run. They have tried and tried and tried with the guy and nothing seems to stick.
I think with Barrett they've not really seen his push out to it's full potential before due to injury and what not, it seems the WWE have had belief in him (which is great!) but for various reasons, out of their control the push that he's been on the verge of has often stopped it's momentum due to things such as injury etc..
I mean Barrett was booked to win the 'Money In The Bank' briefcase before his injury, which went to Ziggler instead ... a great choice of course, but Barrett's been deserving of this push for a while and I hope that the WWE get completely behind this, which it seems that so far they have been.
His character has been developing and had time spent on it for a while, they put a lot into this 'Bad News Barrett' character from the JBL and Cole show, to the TV and now into the ring, it seems they're putting quite a bit into this gimmick and it's awesome!