At present, a sharp eye can detect the momentary glint of the sun off another aircraft at extreme range, the beat of a wing, and smoke arising from an unusual event.
IMO, until we have camera systems that will pick out events such as these with greater reliability than the basic human eye, then the camera systems will be non-starters as well as the associated windowless cockpit.
It has to be better to make sense. Almost as good as the human eye just is not sufficient. To be better, an artificial vision system will have to have a certain degree of interpretive smarts built into it.
At the moment, from what I've seen, artificial vision systems for use in an aviation setting are only pretty good.