I'm not sure what straight traditional D&D even is. It hasn't been limited to straight up dungeon crawls for decades, if it ever was. It certainly wasn't limited to that in the games I play going way back.
That's actually an interesting thing to think about. If we can presume that the adventures that WotC put out for 5E represent was D&D was about for the designers and was what they perceived what the audience thought of as D&D, maybe we pick up some hints baout how things have changed over the last 8 years.
Here is the order of publication of Adventures:
Starter Set/Phandelver (Jul 2014)
Tyranny of Dragons (Aug/Nov 2014)
Princes of the Apocalypse (Apr 2015)
Out of the Abyss (Sep 2015)
Curse of Strahd (Mar 2016)
Storm King's Thunder (Sep 2016)
Tales from the Yawning Portal (Mar 2017)
Tomb of Annihilation (Sep 2017)
Dragon Heist (Sep 2018)
Dungeon of the Mad Mage (Nov 2018)
Ghosts of Saltmarsh (May 2019)
Essentials Kit/Dragon of Icespire Peak (Jun 2019)
Descent into Avernus (Sep 2019)
Rime of the Frostmaiden (Sep 2020)
Candlekeep Mysteries (Mar 2021)
Wild Beyond the Witchlight (Sep 2021)
Strixhaven (Dec 2021)
Call of the Netherdeep (Mar 2022)
Journeys Through the Radiant Citadel (Jul 2022)
Spelljammer (Aug 2022)
Dragonlance (Nov 2022)
Now, I am not familiar with all of those, but it seems to me you can draw a line somewhere around mid 2019 where there is a shift in the style of fantasy being presented. Avernus is bonkers. Rime is "traditional D&D" but is presented as a CRPG in a book (which was new for 5E adventures). While I was underwhelmed by Candlekeep, its use of short adventures written by diverse creators was new, and (as I understand it) improved upon in Radiant Citadel. Strixhaven is a MtG world but it's genre is obviously aimed at those more nostalgic for HP than LotR. I don't know anything about Netherdeep other than it is from Critical Role. Spelljammer is a throwback, but is weird. The most nostalgia driven one seems to be DL, but it is too early to tell if that is the start of a new shift back toward nostalgia or a one off.