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If it is not create by the government, it will pass through the same phase to grow into what is known and used as bitcoins and it will still experience rejection for a while, but by then bitcoins must have been at its best. Most of the creators who are trying to create something better than bitcoins have not been able to yet, because they have only been able to create more altcoins. Except it is another financial system, Bitcoin will always remain the number one in cryptocurrency.
In essence, Bitcoin will be invincible as a system that uses peer-to-peer technology in its operations without a central authority. Even if someone else finds a system that is more powerful than Bitcoin, Bitcoin will still be different from the great system that person discovered.
A number of coins that already exist in the crypto space numbering in the tens of thousands with systems designed with their respective advantages cannot yet compete with the greatness of the Bitcoin system.
Without Bitcoin, all these types of coins would not exist. Bitcoin is the best even in the future.