because of th hard fork it is very unlikely that bitcoins will be replaced by any other cryptocurrency .this is not going to happen in the future run .well it may rise more than bitcoins but i think it will be for a few amount of time .i the last bitcoins will always rule the world.
Bitcoin is just always good only for alternative payment processor and it is impossible that some altcoin can replace bitcoin since we already using it and many company are accepting bitcoin i research even few hours ago that where i am buying some unlock codes for smart phones i notice the site where i am buying and paying using paypal now i am seeing they are accepting bitcoin and they are using 3rd party like gocoin for payment bitcoin processing..