ANW1988, if you have done a lot of research then you would know that a failed OAA assessment counts for diddly-squat as far as the airlines are concerned and you would also have an inkling whether you're cut out for the career.
I find it interesting that you say you love the bird's eye view of flying a glider. That is so far removed from being an airline pilot. I honestly think you need to do more research into different career paths and different piloting roles.
Cheers
Whirls