I think you're wrong. The network is stronger than that.

Yes, those highly-connected nodes could easily kill the network... if they all coordinated to leave at once. Which is a real risk here, because of how high-profile and controversial the issue is right now. But normally, they're just as glued to the network as everyone else. Perhaps even more so, because...

... they aren't creating content for fun. They're creating it to make money off the audience. So they have to stick to where the audience is.

People with blue check marks would like to think they're special and valuable to the platform, but they're not. At this scale, they're a commodity too. They play a different role on the platform, but for the platform, users with different roles is just what makes the whole thing tick and print money.

Think you're over-estimating their value, if they were posting their thoughts elsewhere without the blue check next to their name no one would be engaging with it, it's honestly such bad content.

If you’re a journalist (or your other suggestions) then you’re basically using Twitter as free advertising to (a) your followers and (b) people who read your tweets which have been retweeted. Having people coming towards the way you actually make money is probably worth a lot more than $8 per month to you, even considering that journalists aren’t so well paid (the idea of blue checks getting paywall bypass could be very good for journalists too – they could end up more directly getting value out of people coming to their work from Twitter).

Paying $8 per month for this free advertising seems pretty great. How much would it cost to send this out via actual ads or eg mailchimp (but of course it is much easier to have new people see your tweets than your marketing emails)?