Apart from that, it appears everyone in the game industry is now running towards Unreal Engine as fast as they can. But since UE is a bit more effort, I'm 100% sure that ultra-low-effort mobile "games" will remain loyal to Unity. Because otherwise, they'll need to purchase new templates to reskin.
In case you don't know what I'm talking about, it's these game templates: https://www.sellmyapp.com/downloads/dentist-doctor-games/ They can be profitable with cheap Indian outsourcing on Fiverr https://www.fiverr.com/wajidali892/reskin-unity-3d-or-unity-... and enough SEO skills ... and they're all pure Unity, with most of them already using IronSource for monetization before the merger.
For every other type of game, I would at least check out Godot 4 once it's had a stable 4.0 release. It's easy to learn, supports .NET, and it's actually not hard at all to modify and extend if you know C++. It even compiles from scratch relatively quickly.
Unity's biggest advantage is the Asset Store. If you want a bunch of third-party plugins to make your life easier, Godot has a long way to go.
Unless you are a massive AAA shop with oodles of time and resources to devote to a bespoke engine, if you are writing a game you want to use either Unreal or Unity. It instantly gets you onto every PC, mobile, and major console, and there are lots of programmers and designers out there with skills specifically in those engines.
Maybe if things get really bad, Godot or something will overtake Unity someday, but that day is not today.
Yeah, Unity will stick around for a while. But things do change.
There are great options for different games, teams and markets. Godot. Urho3D. O3DE. Harfang. Stride. Flax.
Do you have a AA or AAA budget? Go with Unreal.
Otherwise, go with Unity.
Godot supports Windows, Mac and Linux. For mobile, it supports Android and iOS. You can export to HTML5.