I agree with you on the fact that a lot of things can change within the crypto sphere in a short period. There are not certainties given the infancy of this sphere, so I am shocked when people think that certain blockchains are too big to fail based on their size now and the trust people have in those blockchain. It is with the same arrogance most people displace when talking about centralized financial systems.
Trust and size in a blockchain/crypto are things that can change quickly esp when these blockchains are not growing and developing the way they should. Development is key and it is the major lifeline of the hive blockchain. When things seem like they've reached a dead-end something new pops up and gets people exciting again.
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Well I would say that Bitcoin is fairly safe. That is not going to diminish is size anytime soon.
As for others, it depends upon use. If there is nothing taking place on the blockchains, they can whither and die. Sure a few nodes might still be running but there will be little interest.
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