We, the users and followers, will decide which eventually fades or increase in momentum on social media. The kind of ecosystem Elon Musk and Mark established, the cruise we all take generates billions of dollars in revenue for them. Although We don't envy their extraordinary intelligence. Elon Musk shouldn't rely on Social Media investment to remain on top of the richest human list without challenge.
Mark Zuckerberg is not on the dick-measuring contest that is the Richest Person rank (top 2), so it does not make any sense to phrase it from that perspective. This is more of two platforms and their CEOs locking horns with each other [no seriously, what is Elon's job title at Twitter at this point?] and we can also expect Elon to order new features to be rolled out on Twitter in response to Threads adding more stuff.