There are lots of marketing dollars looking for a home, and Google is going to be one of the better bets for some time to come.
They may turn into a zombie but they won't die for a long, long time.
For example, cable companies still exist and have a ton of paid ads on them.
Fox makes $3-5B in sales per quarter: https://valustox.com/FOXA
Sinclair isn't doing so good but they're still selling in the hundreds of millions per Q: https://valustox.com/SBGI