Before doing this, Google was careful to make it as difficult as possible to build a replacement for Chrome. Apple struggles to make Safari capable. Mozilla struggles to make Chrome-first websites work in Firefox. Building a new browser is a Herculean task.
Pragmatically, I'm hoping that a Chromium spinoff like Brave (or Edge!? Could MS be the hero we need?) will turn the privacy switches on, WEI off, and get enough market share to make WEI infeasible.