Don't count on it. Have you ever seen how much time and effort has been put in making Firefox, Safari and Chrome compliant and performant? It'll take Ladybird ages to get anywhere near.
Someone could try to merge e,g, V8 and Servo, once that's in decent shape. But even then it'll be time consuming to build an acceptable UI, cookie and history management, plugin interface, etc.
Seems like its easier to crack an existing browser and take away stupid features than to build one. Against TOS but I really don’t care.
Ladybird is pretty good today. A lot of web apps, even complex ones, just work. It's reached high compliance scores for web standards in a shockingly quick period. See here: https://youtu.be/VqzbqsIlaNI?si=YPdwbApq4nVYlPMQ&t=209