LOL, I'm sorry but if a few iPhone owners think getting all huffy about a store not supporting Apple Pay and threatening/deciding (especially when the company gets millions of other customers happily using their credit cards and cash) to go to the competition is going to get a store to change their mind (as if they are scared to lose a few iPhone customers) then those iPhone customers need to seriously step out of their reality distortion field, cuz it ain't gonna happen.
Time will certainly tell. If any company garners publicity, it's definitely Apple. No one (well almost no one) knew about this type of pay process until Apple Pay was rolled out. No one care about Google Wallet. How much more publicity will this generate? How many news pieces? Seems to be quite a few right now and growing. Possibility it will down down as well.
Hasn't been that many years since grocery stores started accepting credit cards. People used to think that was ridiculous. Now all grocers accept credit cards. If they don't they are out of the running. My point is that it's a pay method that is growing in demand. And either merchants will accept it or not. In the end we will see who wins.