"Wrong" is an insane word to use here. I just transitioned from a Nexus 5 to an iPhone 5s and really like the smaller size. The only "wrong" thing in the size discussion is the idea that there is a "right" one.
I hope Apple adds a smaller phone back to their lineup next year as even the 6 is a little large for me. I really like that I can get to everything with one thumb. (What blows the mind is that with that philosophy in mind they don't natively support gesture typing.)
The 5s will likely remain available. Both the 5s and the 5c are still current models.
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He invented a lot of things and was a smart person, but was he a great person?
He invented? His company invented. He marketed. That was Steve's genius.
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The OS was great; but the screen size was always the iPhone's weakness, as demonstrated by the most successful iPhone launch ever, the iPhone 6. Why is it so hard for you to admit that apple isn't always right? Maybe if they increased the screen size back in 2011 they wouldn't have lost so much global market share to android.
Every iPhone launch is more successful than the last.