Theoretically, sure, an ABM system can work.
Theoretically, I could date Jessica Alba. However, realistically, given the vast difference in attractiveness levels ("hottie" versus "overweight, balding nerd"), social status ("more money than god" versus "reasonably middle class"), etc., my chances with Ms. Alba are slim-to-none.
Similarly, realistically, an accurate, functional ABM system simply is not going to happen any time soon. The difference is that the government has thrown billions of dollars at the idea, not to mention 20+ years of research both public and private, and they still haven't been able to get it to work.
Yet still, ABM backers keep trying to get more funding and to promote the idea. Even I finally gave up on Jessica after the third restraining order; at a certain point, you either accept the fact that it isn't going to happen, or you wind up needing psychiatric help.