There really has been a 30+ year full-court press to make DNSSEC happen, including high-effort coordination with both operators and developers. I think the only comparable effort might be IPv6. But IPv6 is succeeding (slowly), and DNSSEC seems to have finally failed.
reply(I hate to IETFsplain anything to you so think of this as me baiting you into correcting me.)
Oh, I was basically agreeing with you.
replyTo really nerd out about it, it seems to me there are two metrics.
1. How much it failed (i.e., how low adoption was). 2. How much effort the IETF and others put into selling it.
From that perspective, I think DNSSEC is the clear winner. There are other IETF protocols that have less usage, but none that have had anywhere near the amount of thrust applied as DNSSEC.