Some recent events point that IBM got a 27 qubit computer (https://www.ibm.com/blogs/research/2020/09/ibm-quantum-roadmap/), and maybe 10 years from now one with one million qubits (see same source). Speculations aside, the fact is that quantum entanglement does proves a remarkable advancement in cryptography, among many other applications.
On the other hand let us recapitulate that the Riemann hypothesis (RH) is still out there, unsolved, and that its proof (or disproof) might lead to an understanding on how to factorize much faster than now. We know that today's internet security is based on prime cryptography, and hence its very close connection to a proof of the RE, even if that proof is only existential (the tools for proving it may show a way for faster factorization, and hence to decrypt in way that can't be done now).
It seems that quantum cryptography might arrive much faster than the solution to the RE, and hence the question. As concerns of cryptography, RE would appear that it has lost its most important motivation to be researched, at least commercially speaking. Thus, RE would remain as a pure mathematical problem ( a very tough one, though), connected, perhaps, with many other mathematical statements that are assumed true, if RE is proven true. So, the question is:
Is RE still relevant for some foreseeable practical applications, other that cryptography?