Mike,
You're 100% correct. Ten years ago, I used to think a cell phone wasn't a necessity. We'd all gotten along just fine without them all of our lives. Who doesn't have on today?

Someone may prefer the feel of an actual book today, but as you've said, their grandchildren won't...not any more than we'd prefer to dial a phone that hangs on the wall in our kitchen.

Mike,
I especially like it when you said, "Worry focuses on the bad things that might happen. Imagination focuses on the good things that could happen."

That being true, imagination would seem to involve an element of faith. "Now faith is being sure of what we hope for and certain of what we do not see."

Worry removes God from the equation. Faith and imagination together bring Him into it.