The theory of inevitability is, at its base, a philosophical view of the material world. According to inevitability proponents, interaction between all form of matter and energy is predictable, and thus events as humans perceive are all inevitable and predictable.
Obstacles
The theory is not practical because predicting the interaction of all matter with high accuracy would require time to be effectively stopped in order to collect all particle data. The sheer amount of computational power required to emulate subatomic interactions would also incur the need for computers of the quantum order.
Scientific Worth
The theory cannot be proven nor tested because of the aforementioned obstacles. It is viewed as a global philosophy of matter interaction.