Impossible. I believe 100 percent that bitcoin cannot be replaced by litecoin. There are still altcoins that are more sophisticated and technologically superior than litecoin so that it is impossible if litecoin will replace bitcoin. In my opinion, the great altcoin that exceeds the greatness and sophistication of this litecoin technology is ethereum. Ethereum proved almost perfect in blockchain technology. Ethereum also proved to be of real benefit so I believe that what might replace bitcoin is only ethereum. If ethereum replaces bitcoin then it is appropriate because the technology that ethereum brought is also greater.