I think Apple's taking a risk by making this change to wireless headphones. Not only that, it's that in all likelihood battery life will be the same since that's Apple's track record despite the hype.
So I'm taking a pass and not buying an iPhone 7, instead I'll enjoy the 6 Plus I have and stick to my wait and see policy on anything new from Apple. That'll be a money saving change from my usual annual upgrades.
Ironically that's how several of my friends feel also, we skipped the 6S due to lackluster features and it's been a refreshing change.
It's good to get off Apple's upgrade train.