The point is that this is how Twitter already works: it's 99% a platform for rich people, companies, and big journalists to broadcast their opinions. Sure, there is some minor amount of "the masses" voicing their opinion, but it's marginal. And more importantly, the vast, vast majority of Twitter's users never tweet, and only look at tweets from the initial group.
The poster is saying - why keep up this charade of being a social media platform at all, worrying about bots harassing your ad-viewers and so on? Why not embrace how the platform is already going, and get more direct monetization from those looking to broadcast?
If you want to see platforms for voicing opinions of the masses, Facebook and Reddit are doing much better at that, witch much more organic conversation and interaction.