Although consistency is amazing for improvement in pretty much anything, not having enough variation can definitely take its toll.
Whether it be rolling with the same person over and over again, or having the same type of drills/rolling patterns... changing it up every so often makes the training fresh and also challenges the body in different ways.
This can be anything from changing the length of the rounds, to changing the number of people you roll with each class.
Even bringing in a guest instructor to see a perspective from a different style can make a world of a difference.
So remember, if you feel that your training is getting too repetitive in one aspect or another, don't be afraid to ask your instructor after class for some variation.
Now a recent match between Joao Assis and Davi Ramos