if growth doesn't materialize, then the infrastructure build out plays out exactly like the dot com bubble. the biggest difference this time around is the earnings. if those fall, the rest crubmles.
[1] a broad and poorly defined group of "we" - typically investors and tech-bro types.
Earnings did come, and the outcome of the internet include Google, Amazon, and others -- several of the ten biggest companies in the world.
In 2000, there was no sane way to predict who the success stories versus failures would be, timeliness, or otherwise.
AI will be a big change. We don't know how big, when, or who the losers and winners will be yet. Everything could be grossly overvalued or undervalued. We'll only know in hindsight.