Yes, Look how far we've come already. We use phones for everything. People don't even talk anymore, they text.
In all practicality, iOS has really changed very little as far as radical redesign goes. I had the first iPhone and then abandoned it about a year later. I came back to iOS 6 and iPhone 5. And not much was substantially different. Just tweaks, but otherwise completely familiar.
Up to 8.1 now, and still much like the very first iPhone. Tweaked, enhanced, and improved. But not radically different. Nothing that would be a Learning curve to use the phone's basic features if I were coming directly from the first iPhone I remember.
The biggest improvement really, is that I would have nearly killed the battery on my first iPhone by typing this response.