I mean, the ad business is still by far the largest chunk of their whole business, which is why I think their overall revenues, profits and dominance will decrease ¯\_(ツ)_/¯
Display is another good example of why. Like half (?) of it is YouTube, which will be fine, but the rest comes from non-first party properties, which are already seeing drastic drops in traffic. Just as with the shrinking of SERP ads, there's no way to stuff enough ads in chatbot conversations or to compensate for the display ad revenue dropping either.
I'm long Google (monopolies are usually good bets, bullish on AI + GCP, plus it is disrupting itself before others can so has good long-term prospects) but I can't see how that will compensate for its main cash cow today being cannibalized, so I fully expect future returns to be less than historic ones.