It's currently estimated about 3 million people own some amount of Bitcoin.
i would love to have more information on this. such as where did these estimators get this number from? is there an article about it and can you break it down.if i had to guess, i'd say it is a lot more than 3 million. there are more accounts on sites like blockchain.info and coinbase!
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If Bitcoin becomes mainstream, and say 50% of people in Europe and NA own Bitcoin, how much would it be worth?
50% is huge, by that time price would be a lot more than this. somewhere around $500,000 seems like a good estimate to me. and that number have been thrown around a couple of times by different speculators too. but if you think about it in terms of satoshi that would be $0.005 per satoshi which is pretty low still 