Usually people who get 2000 rushing in a season have little of no passing game, thats why they get so many carries. J. Lewis had a rokie QB and subpar WRs. He got the ball like every play.
B. Sanders(the best RB of all time) was basically the only weapon on his team his whole career. He got a lot of carries.
With the solid mix of run and pass our offense likes to run, it would be almost impossible for DD to get 2000 yards unless he averaged like 7 YARDS PER CARRY
for the season and thats basically impossible.