Saying that the Metaverse will flop is like saying that the Internet won't become a 'thing' in the past -- the main reason supporting this inevitability is the direction of our time usage is changing. We tend to use our time with things that are more digital due to the convenience it brings.
Starting from sending emails/text messages that take less time than sending a letter, the loss of messages is also less. The thing that will take the least time to be delivered is less (if viewed from the past: face-to-face communication -> letter (there is an increase in paper and writing to maintain the condition of the medium and reduce the time it takes to communicate successfully (no need to walk to find the person we want to communicate with)) -> email (it's the same thing, speed, convenience, storage, but it's in a more modern form, but here you start to see an expansion in the scope of communication, such as attaching videos, or various artistic elements...) -> social platforms like IG/Facebook/Twitter/.. (Which expands on the part I mentioned about the depth of communication to be more detailed, real-time interaction/feedback) - getting to this point, you can see that in addition to ease of access/usage, the experience gained from using it has also increased. There is a greater creation of interaction between the communicators and the medium in sequence, on the gaming side there is also development in the same principle. The images are more beautiful, players can interact with the game more, there is a creation of emotion with the plot/characters, etc., the effort to create immersion has been continuously developed. The game attempts to emulate the real world as much as possible.
It can be said that we are gradually moving from physical -> digital, and we are increasingly based on things that are generic. The next path we are heading towards is an immersive experience (some may say 'But AR/VR has already reached that level, there are already many games and software that can do it, I don't see how it relates to the metaverse.'). This can be answered by saying that off/non-interoperable platforms do not have (or almost do not have) the 'connection' element (like the internet) that is important for scaling and the development of a sustainable ecosystem.
The point is that it is developed and controlled by a single entity; there is no joint development (whether from competition or mutual support in the form of leveraging) that must be this way because the immersive experience elevates the performance and convenience that I have explained in previous principle-based explanations. Learning/various forms of entertainment/exercise, or even work.
All of this is simply to say that the metaverse (at the very least, the necessary components of interoperability; because there is still controversy over a universal definition of whether or not a true 3/D environment is required) has no way of being just a passing trend that dies out. By nature, technology gravitates towards the more abstract side, it's the future. It's just a matter of who 'succeeds' - it could be Meta, it could be Apple, it could be a company that hasn't even been created yet in the near future, it could be a blurred line of collaboration - but I'm sure we'll see a paradigm shift in how we use our lives for sure.

