I didn’t imply that UE4 will rule over all, but it will rule over Unity (or what’s left of it). I’m being specific. Unity has an advantage of their own browser plugin stuff, but that’s a sole and only advantage left. Soon enough, for those who develop 3D games on other platforms (Mobile, PC, Consoles), will find no reason to stick with Unity. You will find many Unity users converting to Unreal, because the choice is a no brainer for the vast majority.