Right–the AAA studios will just consider if they should use Unreal or an in-house engine. They’ll put it all in a big spreadsheet and come to a conclusion.
Indie devs that are on Unity are going to get hurt by this scheme. They’ll also get hurt if you don’t buy their games because they’re in Unity. The choices here aren’t great.
The one thing is Unreal seems to have been preferred for a while now, anyway. Unity was already losing market share, and is now only going to accelerate that.