The problem i can forsee is that they let the cat out of the bag.
Even if they go through on a 25% without the exclusivity clause. Everyone saw their intentions and initial submissions. It's not as if this is a one way street. For all we know right now SIA could be looking at (or might not care ar all) altering their deal with VA when it's up for renewal.
Basically VA and QR has played their hand and they didn't manage to slide some of the jokers through unnoticed.
How everyone will respond going forward, we'll have to see.
