It becomes impossible to block ads in all browsers new forks will be made and the features we want will happen. The bar to spin and maintain a new browser is high but it's not impossible on there are a lot of people that want this
You should check out Ladybird browser, it's an impressive piece work, it's definitely no ready for everyday use, but it is proof that a small community can develop and maintain a project as complex and large as a browser.
It is probably the only browser in active development that is not being paid by Google, even Firefox gets most of its income from defaulting the search engine to Google