No no and no...of course Apple wants iPhone 6 7 8 users to give up there phones, it’s all about money.
Wants? Yes, sure, why not. Needs? No.
Needs would be about Apple not being able to make a profit without those folks upgrading. Half the iPhones sold in a quarter are not going to iPhone 6 or 7 or 8 or any other model iPhone users. They’re going to people that have never owned an iPhone before. It‘s FAR more important to sell new phones to people who want what an iPhone is
today than it is to try to sell phones to folks who have proven, year after year, that they’re not interested in what Apple’s selling. It’s always easier to sell your product to someone that wants it
Plus, as you say, it’s all about money and the REAL money is in services which is pulling in the amount of profit that ANY single Fortune 500 company would love to have. And, that’s recurring month after month and growing over time.
Mark my words if Apple does this and it has better battery life...they will come.
The real point here is if Apple adds TouchID
1. It’s not to get someone to finally let go of that iPhone 6. (Me? I still think the TouchID option is for a future iPod)
2. Most folks with 6’s, 7’s or 8’s likely hate the newer iPhones for FAR more reasons than just “It doesn’t have Touch ID”. Having TouchID would just remove one thing they hate while leaving in place ALLLLL the others. Which is fine. Apple’s never focused on trying to satisfy ALL customers, just a chunk with enough money to make the profits they need to stay in business.