That's ~1.16 advisories per year. Show me an operating system, web server, and web application platform (Java, RoR, PHP, whatever) that average less than ~1.16 per year each.
Further, out of all of the advisories for OpenSSL, how many would be mitigated using the technique from the article? Few or none, because most security issues in OpenSSL are about the way it implements the protocols (problems in the PRNG, problems parsing X.509, etc.).
OpenSSL is somewhat notorious for being a high-maintenance codebase. I personally think jailing it is overkill, but this argument (about whether the code is perfectly safe for a pre-auth attack surface) is a rathole.
Further, out of all of the advisories for OpenSSL, how many would be mitigated using the technique from the article? Few or none, because most security issues in OpenSSL are about the way it implements the protocols (problems in the PRNG, problems parsing X.509, etc.).