Usually a music "emerges" when it breaks into the pop charts - as punk did in '76.
Talking Heads are hard to categorize as a "punk band", but if that's the standard then the list is also missing The Dictators, Devo, Rocket From The Tombs, The Zeros, The Heartbreakers, X-Ray Spex, Gang Of Four, Wayne County and the Electric Chairs, The Cramps and, unbelievably, the Buzzcocks.
I figure if The Jam and Blondie qualify, The Talking Heads do too.
As far as pop culture, it was really in 77 that most people started to hear of Punk, see it on TV, etc. One Top 100 single doesn't really put it in the radar of middle America.
Oh, I can't believe I forgot the Buzzcocks! Has anyone else seen that AARP commercial playing "Everybody's Happy Nowadays"? Nothing else has ever made me feel so old.