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anything that relies on "conventional" infrastructure will be insecure. Yes, banking and most of the internet too. But I ended the post with an optimistic view, that researchers will find a way to preserve stability.
But the transition period will be a bit unsettling, that's for sure.

Then why present it as an exclusive threat to cryptocurrencies?
Alternatives may not be safer.

no no no. I did not imply that it is only a threat to cryptocurrencies. But because of the recent stratospheric rise of cryptocurrency valuations -not to mention the fact that this social platform has one too- I considered it relevant to remind readers that we are about to witness a disruption, one for which they should be prepared for. Or at the very least be knowledgeable.