Ladybird is on the trajectory to do this. I agree it's an enormous project and different from a lot of other open-source offerings, but I think there very well could be even corporate offerings support. They'd support it the same way Linux and other big projects (like what Red Hat and Apache do) because there's business needs for browsers that aren't Chrome or Safari.
It's not all, but it doesn't take much imagining some industries want a stable open source browser with, say, security features they can toggle in to their standards. I hear people here all the time who say they would pay for a good browser but won't because Mozilla doesn't spend it on the browser. I can see a productive marriage.
Ladybird has the advantage that they can start with a new architecture, and they seem willing to sacrifice features. But I doubt we will see them become a real competitor for Chrome and Firefox. And we will have to see whether they will at least support DRM-services like Netflix, YouTube, etc. making them a viable alternative for the casual users, giving some foundation for gaining traction in mainstream.
It's not all, but it doesn't take much imagining some industries want a stable open source browser with, say, security features they can toggle in to their standards. I hear people here all the time who say they would pay for a good browser but won't because Mozilla doesn't spend it on the browser. I can see a productive marriage.