I expect it will take a while.

Nobody really wants to decrease the number of humans in their fiefdom, right?

However, if AI actually works out and produces tools that make people, like, 5x more effective, than a software company can replace an existing one at 1/5 the cost with 1/5 the engineers. Fewer people to manage, less deep corporate tree, and maybe some of those middle layers will also use AI…

But nobody wants to decrease the size of their fiefdom, so that company will need to be built from the ground up and then wipe out the competition.