There's still way more money being invested in the traditional world of advertising than what's being invested in the analytics and data side. Creative agencies haven't gone away. Agencies of Record are still the traditional shops (DDB, Ogilvy, etc.)
The data side is still very new (<20 years old). I’m expecting that once the old agency guys and old client side guys die off you’ll see bigger changes.
But...
There's still way more money being invested in the traditional world of advertising than what's being invested in the analytics and data side. Creative agencies haven't gone away. Agencies of Record are still the traditional shops (DDB, Ogilvy, etc.)