But still, what is the possibility of the existence of metaverse without blockchain technologies?
There is a possible way of doing that.
Now that every company has an idea that Metaverse is a click on this generation, they can make their own concept of how to build it without running into blockchain.
But because most of the knew that metaverse started with integration of blockchain, they would still probably be working under it.
Well wait for it! There is gonna be someone who must be working on the concept of solo metaverse. Though the names mismatch but the idea behind it does not. Dependancy on the blockchain can create mass confusion while segregation in the later times if required to do so. Blockchain is obviously backbone where the whole seeding activity is taking place and I think its not that much difficult to create the "virtual environment" for the metaverse itself. It can bloom on its own, have proper integrated dynamic or stationary servers somewhere and run on them completely and solo!
Though its possible, its not needed I guess. With the time blockchain is getting way stronger and deep routed so there is no way its gonna fail. In fact most of the companies will heavily invest into its classic development and so on.