I might have gotten an iPhone 6, but after what most companies would consider a horrible rollout, Apple still hasn't fully admitted they did anything wrong and I just can't tolerate a company in that much denial. There is a design flaw in the iPhone 6 Plus that needs to be addressed,
Bendgate was a fabrication (let's not get into a debate, we'll agree to disagree) but it may have impacted sales. To what degree we'll never know. I admit I was nervous until more info came out and then got one in my hands.
But you might want to rethink your definitions of "horrible rollout":
Apple Q4 2014 earnings: revenue surges on huge iPhone 6 sales
Apple's
profit for that quarter was about 50% of Google's
revenue. There is not a company on the planet (or even a comet) that would refuse those numbers.
and their OS quality control is non-existent.
This is sadly true. I'm quite disgusted with iOS 8.x and the glitches. I've mostly enjoyed Yosemite though, and the most recent iOS security hole being reported does not apply to at least 95% of users, and of those it could possibly affect there is still a very, very low probability, so let's keep things in perspective.
Not saying Google hasn't dropped the ball on Lollipop as well, but for the time being I think most people are going to stick with what they have until both these companies stop treating their customers like beta users and crash test dummies, and that means no exodus from Android to Apple for another product generation at least.
I don't think there will ever be a mass exodus one way or the other. Honestly, I got an iPhone 6+ without really considering a large screened Android because I've been inside Apple's ecosystem since I bought an iPod Nano 8 years ago, which led to an iPod Touch which is when they
really got their hooks into me. It's been all downhill since then: Macs, Apple TVs, several iPhones, registered

developer, iPods for christmas for the kids this year... hell I even bought my first iTunes movie a few days ago (something I never thought I'd do).
Google doesn't have as much lock-in as Apple, but there is still the factor of what you're used to and where you keep your (digital) stuff. Also, there is honestly a bit of a barrier to
entry into

World. I wouldn't be surprised if a large % of Android to iPhone switchers are unhappy.