Yeah, consider the insane complexity of Web standards, and the fact that even Microsoft failed to create a browser with an independent engine: https://waspdev.com/articles/2025-04-07/will-there-be-a-new-... . This means that not only we are unlikely to see browsers with new engines but also that the existing browser engine diversity might even shrink if an existing browser becomes underfunded and / or loses a critical number of users / web developers.