The grandstand has special wheelchair platforms accessed by lift, for GP the space is more limited then usual as TV people have used some of it in past. There are also wheelchair platforms at each end of the sound stand. best to call the club to confirm availability.
Riders who currently double up/down will lose at least half their pay packet probably more.
They will have 3 options :
Try find a team abroad (will be difficult as most foreign teams signed up)
Ask Championship team for significantly higher wage
Retire and get a job out of the sport.
Option 2 or 3 will have big impact to Championship
Discovery WB had 100 staff on site each GP, which was probably well over the top, but involved constructing the pits and that stage in middle etc, presume all that will be gone now.