Authentic secure DNS is in fact not important, and is not worth working on. I think the lengths you had to go to just now to establish some kind of marginal value for SSHFP is a good illustration of why. And that's because we've designed protocols for the past 20 years to assume the DNS is insecure. SSH, in particular, has "don't trust DNS" baked into its DNA; it's a response to the old Unix r-commands, which did trust DNS.