It is already happening.
The things agencies are able to build for themselves and their clients for internal reporing, leveraging ML & AI, creative output is faster than it has ever been, creative insights, etc
The landscape is changing, margins are growing, which is allowing agencies to be able to take on more clients, yet stillprovide more value than ever before, all while scaling more efficiently and effectively for everyone involved.
Just have to put the right tools and people in place.
This has never been the case and not at this speed.