The silver lining, if indeed there is one, is that Jamiel Showers and Dak Prescott are certain to get more attention and accordingly, more repetitions in practice. Their development will be accelerated. The extent of any difference this is likely to make is yet to be determined.
As far as those two are concerned, however, Moore's loss is most assuredly their gains in terms of their individual development. Precisely what action the FO may or may not decide to take in the meantime begs other questions. Questions of seeking outside help will also be weighed.