if with just 10BTC can make you become a millionaire , what about people who own 1000BTC? i think they'll be a quillionaire 
those people will dump long before, because their target is lower than those that have only 10 btc
so those "1k people" will be the "10 btc people" in the future, with the same opportunity for the former
Yes I agree! The distribution of wealth will be happening just as it's happening all this time so far. Yes, there are still people with 10,000+ bitcoins but there are not as many out there as they were in the beginning and not all of them who had 10,000 bitcoins at the certain moment are currently millionaires. People have been making all kinds of mistakes!
As for the OP's question, I don't know will you be a millionare with 10 BTCs but you will gain a considerable wealth from this in the future. Of that I am sure!