Well in 10 years you will have exactly 3 bitcoins.
Unless Bitcoin forks.
Obviously, you're referring to a chain split, but then still, you'll just have 3BTC.
Whatever chain split happens, there can be only one Bitcoin ~ the coins you will have sitting in the other (minor) chain, are nothing more than altcoins.
That is right theoretically. But it will take some time to find the main one.