Well, now that DANE is nearly an RFC I should change Chrome to use it rather than the TYPE257 records.

But the important point is that DNSSEC stapled certificates don't need the browser to perform any extra DNS lookups. The certificate itself contains the DNSSEC information and signatures. Since DNSSEC is signed the data can come over any channel; it doesn't have to be port 53.

Unencrypted DNS still leaks the hostname that you're visiting - that's true. However, the destination IP address probably leaks the same information and, if not, we sent the hostname in the clear at the beginning of the TLS handshake! (That's SNI, it allows SSL virtual hosting.)