Just to replace it with what he calls "payment verified", which basically means you have 8$ and means to send it to twitter. Which apparently is worth less than nothing.
It kind of reminds me how a while back somebody posted proposed redesign of stackoverflow to make it more nice from UX perspective. However this person wasn't a user of stackoverflow and didn't understand how much value which features provide and suggested changes that would make very valuable features removed or made less easily accessible while bringing to the front features that are not very useful.
I think it just helps to be a user of the product and have a deep understanding for it before you make any changes. Elon used twitter a lot, but in pretty unusual fashion (because he's world famous billionaire) so he really didn't understand what's most valuable part and took it for granted.
It's really a bit surprising that noone told him that his tweets are worth anything only because people reading them can know they come from Elon not some guy who paid 8$ to call himself Elon on Twitter.