Nothing is stopping it. However, for mass adoption to take place it would need to be more perfect than Bitcoin.
Good Luck, I truly hope those that try succeed!
"there be a better protocol"
It is hard to wrap our head around this concept as history shows that there will be newer and better things created in the future.
This is what normies fail to understand and would not want to acknowledge. To them, it is always possible to have something better than Bitcoin, which is yet to be created.