But at this point, everyone's doing it, so apple tanking wouldn't be any more likely to cause change than Kindle or B&N tanking or anyone else.
Also: Apple's store is not going to tank. That's just wishful thinking.
What would be optimal would be for Apple to tank selling eBooks and then the others could go to the publishers and say...
Apple did not do well with your agency model. We will not have it and you will do away with it. We want to be able to sell eBooks without unreasonable restrictions.
And then the agency 5 give in and life is good.