Groundroll is pretty much a useless figure nowadays. You can change it a lot by using intersection data, reduce to the max and improved climb speeds etc. For example with a lightweight B737-700 (around 55t) i can comfortably use up to close to 3000m on a 4000m runway if i use everything at my disposal (derate 2, assumed temperature, improved climb with a Vr close to 170kts). I can also get into the air and 35 ft within quite a bit less than 2000m with the same weight (around 1500 unreduced iirc).