OP's "don't believe" is a pure speculation at the moment. We know nothing about potentials of future technologies. If quantum computing become power enough to break the current ECDSA scheme and other algos involved then quantum resistant cryptography will take the place. The biggest problem for scientists in the 17th century was how to clean the Earth from a layer of manure that (as they believe) will cover it in 100 years. That problem disappeared after the horses (- the main means of locomotions in that time) were replaced by steam and an internal combustion engines.
I think that post-quantum cryptography will take its place before quantum computers appear or not. The problem with elliptic curve cryptography is not that it can be broken, but that it is impossible to check the reliability of the elliptic curves we are forced to use. There is a lot of information on this subject from specialized sources, the main outcome of which is the fact that some elliptic curves proved to be unreliable, even though they were recommended by very influential, world-renowned organizations.
In addition, the existing cryptography on elliptic curves is based on unproven statement, on assumption, on hypothesis.
Another problem is that hackers do not break cryptography, but steal keys, cracking key infrastructure.
No one is paying attention to this. As long as it doesn't affect anyone personally.
And here quantum cryptography on the one hand solves all the problems of elliptic curve cryptography, but on the other hand does not solve the problem of key infrastructure compromise at all.
The solution of the future is keyless encryption technology. Such technologies, as far as I know, are already being developed.
Today, the main danger for hacking comes from artificial intelligence. And it is no longer theory, it is practice. There are already break-ins based on this technology. Keys and passwords are being compromised again. It was reported this month that more than one billion accounts could be hacked using artificial intelligence. Why? Because there's something to steal...