I hope Ladybird and Servo succeed. I tried Servo a couple of years ago and it was quite useless, unable to do anything, so I'll have to check back and see how it's doing sometime and see if it's improved.
UPDATE: just tried the latest Servo build on macOS. About 100 MB download, not bad. Started fast. Kind of works. Fast but not very smooth, lots of repaint flashing etc. And text fields and text selection on the web page work poorly or not at all.
I guess they're focusing on interesting internal stuff rather than the basics of loading a webpage and allow you to highlight text and copy it, or click in a text field and edit the text. I wonder whether it will graduate to a real browser sometime.