There is nothing answered in there. Just "It'll be fine" and vague pointing at unrelated ecc vulnerabilities in some libs. It totally lacks any rational arguments.
This doesn't guarantee things will work. In cryptography there are no guarantees. In particular, failing to transition fast enough can also lead to vulnerabilities (by this I mean quantum attacks. Cryptographers are increasingly worried this may happen very soon. I've seen some estimate as soon as 2030). So there is an underlying tension in changing, and also a clear worry about not changing.
My blog posts are supposed to be informal and conversational, not pure logic. If you want "ratioanl arguments", look elsewhere than personal blogs.