Most don't switch as they have in house skills that would cost to retrain. The real kicker is the big studios of the future that started their projects on Godot. Those Godot games that succeed (like Cassette Beasts or Brotato) may fund the big studios of the future, and you know their leads will be Godot specialists looking for Godot devs.

Other big studios may trial Godot, but when the seed is planted, the trees take 2 to 5 years to mature.