This implies that the theory of evoloution has a low power to make future predicitons.
This is true as far as it goes.
If you compare the predictive ability of Newtonian mechanics for the behaviour of bodies in motion, i.e. projectile flight, to the ability of an evolutionary biologist to predict any particular mutation or the evolution of any particular trait then the predictive ability of evolution, in terms of predicting the future course of evolution, is virtually non-existent.
This isn't a failing of the theory though but a consequence of the nature of evolution. It doesn't mean that evolutionary biology isn't predictive, but it isn't predictive to the same extent that Newtonian mechanics, quantum mechanics or organic chemistry are.
Those fields can be exquisitely predictive, not being as high powered as these does not mean evolution is not predictive.
TTFN,
WK