It's funny that you mention that and you'll probably get downvoted for it, but I've actually been thinking about that these last few days.
A person's phone is a very personal and individual extension of themselves. Back in the day nearly everyone had a different phone, and in the off chance of seeing somebody else with your phone it was a cool coincidence, "Hey look! I have the same phone as you!" Kinda like sharing the same birthday with someone or running into someone wearing the same tshirt. But if suddenly a HUGE percentage of your friends, your coworkers, and people you walk by in the streets start having the same birthday as you or start all wearing the exact same tshirt as you all the time, it starts to become a little disconcerting.
And I have very recently been feeling this about the iPhone. It's not that I think I'm better than someone because I have an iPhone, so I don't want the "common folk" to have one too. I've always enjoyed the spread of iPhones and found it very fun to see so many people with them, because I think iPhone's are the best and I have an unnaturally strong inclination to want Apple to succeed. But it's starting to be a bit odd to see SO many people with the exact same phone as me. And I admit, I did enjoy being ahead of the curve when I got my iPhone 3G on launch day... I mean everybody wants to feel like they have the best, and it does tarnish that a bit when everybody and their mom has it also.
And to think, right now Apple only has about a 30-40% marketshare of smartphones. Can you imagine if Apple was able to capture the same smartphone marketshare as they have on iPods or iPads? Try to think about this for a moment. 70-80%? There would be so little individuality.
Now I'll probably get downvoted too.