And they're never GOING to use it, because Twitter isn't for them.
The Tiktok crowd is not the Twitter crowd. The Twitter crowd is not the Facebook crowd. The only platform that truly has cross-group viability is instagram, and that's only because it's a visual platform.
Twitter is a place where you make short, concise statements and people yell at you. Remove the character limit and it's just a feature-barren Facebook but with a bunch of people you don't even personally know. Everybody has been crying that it can "be more." It doesn't want to "be more." "Being more" is antithetical to the spirit of the enterprise and will kill it.
It's popular but it's mostly garbage where people scream at each other, among the bots and scammers. You can improve the interaction modes, improve discoverability etc. thus improving its value per user instead of inflating total number of users.
> What unrealized potential does Twitter have left after 16 years of existence?
How much potential communication was left in the human race have after the first 7,000 years since written script started appearing? The answer is, most potential was still unexplored.
Everything in modern civilisation is still young. Especially new communication platforms.
The potential value of a communications platform is always handwavy up to the point the revenue is realised. It is well-nigh impossible to forecast what the social media landscape will look like in the medium-long term; especially if someone cares about profit. Twitter has only been experimenting with making money since 2018.
Twitter had ample time before 2018 to experiment with making money, though. I'm not saying that Twitter should have known how to do that in 2006, but they probably should have by the time they IPO'ed 8 years later, in 2013.
And Glancing over their S-1, they're making money now with the same means that they were planning to in 2013.
What unrealized potential does Twitter have left after 16 years of existence?
Twitter is incredibly popular, but as Docker already showed, being incredibly popular doesn't have to translate to financial success.