Most people agree that Bitcoin will not be the only coin in the long-run, but there will be a few for different niches. Now, how many niches are there? Will it be 3, 7, or 100? Here is my guess.
What is the essence of money? The standard definition is “a medium of exchange, a unit of account, a store of value”. These different aspects suggest that there will be different coins survive long-term, which specialize in different aspects.