Stapling needs to be an intermediary step, in parallel with existing trusted CAs. When stapling was tried first in Chrome, no CAs were interested in setting up something like Let's Encrypt, using DNSSEC to automatically issue certificates.
No it doesn't? Why would it? I'm confused by what it is you think CAs have to do with DNSSEC stapling. CAs are absolutely not the reason DANE staples failed.
Staples failed because they couldn't work alone. They were considered a replacement for completely self-signed certificates.
That's why the committee tried to mandate the stillborn pinning idea.
The option to use stapling in addition to a CA-signed certificate was not really considered. After all, if you paid for a CA-signed cert then why would you bother with stapling?
