I currently have wireless charging on my device (Blackberry Priv) and I never use it. So to me, if i purchased the iPhone 7s or 8 and Apple left it out, i wouldn't be upset.

Don't get me wrong, it's a lovely feature to have and I know A LOT of people use it and prefer it over a cable but its not something that would be a deal breaker for me.
That being said, if Apple wants to keep up with the Android world, i would say they need to add it in. Just like they were lagging behind with NFC. It wasn't ultra important to have, but it was a nice feature that I'm sure many would have loved a year earlier
