At least from what i have been searching, it seems godot is gaining some good traction.
I don´t know enough yet of neither of them(unity/unreal/godot) to really compare. But just by the name of the features it would appear that they are playing catch up to unity/unreal. i do hope it gets better and i am sure i will check godot in the near future. Once i got time to really study computer graphics at a low level i would be interesting of contributing to it.
If it does reach a competitive level i bet some game companies are going to start investing in it and it could reach the balance that linux has. Companies would invest in it to use it internally instead of creating custom engines from scratch.