I have automated IPMI certificate rotation set-up through Let's Encrypt and ACME via the Redfish API. And this is on 15 year old gear running HP iLO4. There's no excuse for not automating things.
People will just roll out almost forever-lasting certificates through their internal CA for all systems that are not publicly reachable.
Oh yes, vendors will update their legacy NAS/IPMI/whatever to include certbot. This change will have the exact opposite effect - expired self signed certificates everywhere on the most critical infrastructure.