He's gone. Look, that's the deal. You can't stop the kid from becoming a head coach somewhere and having his own program. There's no salary cap on coaches, but this isn't about money it's about ambition.
If the Cowboys' offense continues on this hot streak and they make a run for the Super Bowl, Garrett stays, Moore gets another job and Kitna is probably your offensive coordinator next year.
If the offense flounders and the Cowboys don't make the playoffs, they're both fired anyway.
The only scenarios where Moore stays are - 1) Cowboys win a Super Bowl and Garrett retires into the front office, Moore gets promoted to head coach or 2) The offense stays hot but the Cowboys get bounced from the playoffs due to some big coaching mistake. I actually believe that years from now we will find out that Jerry came close to firing Garrett after his conservative approach in OT against the Texans' game in 2018.