Unity is unlikely to unseat Unreal as the primary engine used by AAA games/movies, but it still has a decent share in both AAA games and movies.

Still, the game engine market is unlikely to be dominated by a single player anytime soon. I think you'll continue to see something that looks rather similar to the mobile OS space: lots of players, but ~2 dominate the space. Unreal's revenue cut is also a lot more prohibitive than Unity's, so you'll also keep seeing a healthy indie ecosystem (which translates to a community, assets, etc.) in Unity.

A lot of Unreal's recent investments are incredibly impressive. Especially with better rendering and realtime raytracing. But Unity is also making some big investments, DOTS (see https://unity.com/megacity for example) comes to mind in particular.