"Through half of the season, Gurley has 92 carries for 355 yards in 2019, along with 15 catches for 81 yards. That puts him on pace for 710 rushing yards and 162 receiving yards."

This is slightly incorrect, given that Gurley has played 7 games (and so averaging 13.1 carries/game). Assuming he plays 15 games he's on pace for 761 yards rushing and 174 receiving.

I think if you remove the anomaly of the Tampa game where 1st half penalties and the 21-0 deficit obviously affected their ability to run that you'll see what his real workload is which is 14.5 carries/game. Play that out and he would end up with around 210 carries by season's end.