In theory it is possible , but there is to many "if" ... All I know is that bitcoin need to do something with its transactions speed and fees , otherwise another cryptocurrency will take the 1st place . Of course , it can be Ethereum , but there is another options for it too
In theory everything is possible but in practice not everything. We are all forgetting the dynamics of crypto currency world. If there wouldn't be bitcoin, would we still have this active crypto market? bitcoin is the one who started the story, it will be there allways as dominator factor.