I do not think that this will happen, the bitcoin is way too big and I do not think it can be replaced anymore by another cryptocurrency.
Me too I am strongly believed that bitcoin is not going to be replaced by another crypto currency and how it is going to happen if bitcoin is the mother currency.
And all of the alt coins are depending their value with bitcoin so it is very impossible that bitcoin will be replaced by another alt coin.
People are more familiar already with bitcoin.