That'll immediately remove a lot of useful contributors, including journalists in developing countries, people working on interesting things in niche areas, and

That'll immediately remove a lot of useful contributors, including journalists in developing countries, people working on interesting things in niche areas, and so many others. Every network analysis of Twitter shows that the majority of people are not all engaging just with the blue checks or the most popular accounts. There's a huge long tail that keeps most users on the platform.