It's a finite quantity.. sure they can be split into many pieces, but something is worth what someone is willing to pay for it.. Take gold for example...
There is a fixed supply, and no one can change that, not even the real satoshi nakamoto (and we do not know if he is really alive or if he is dead/have ever existed)
But yes, they can be divided in other pieces, or just be forked, like it happened with bitcoin cash on the past.
Nowadays there are a lot of forks, but they are not the same, they are just for profit purposes, they are not taking the main "reason" of creating a fork, they are just using that idea to fill out their pockets, nothing more.
There is a fixed supply and no one is able to change that.