I think you have to qualify somehow to get into the combo series big dance next year, That should cull out many of the backmarkers I would guess.
Not sure how it is gonna work with the combination races, though its just going to be at short tracks (K&N does not go to any tracks over 1 mile, so 15 year olds can run for the championship), they have announced that it will be at short tracks. So I'm guessing the format with be similar to ARCA's current Sioux Chief Short Track Challenge (championship of just the short track races). So i don't know if they will have any requirement for teams to run those.
Though, i doubt there will be a huge amount of cars running the races anyway, so i'd imagine any competitive team will have no issue getting in.
Salem had 19 cars, 10 of them (maybeeeeee 11, the 11th was kinda a crappy good car or a good crappy car....) were good competitive cars. The rest of them were the ridiculously slow cars, i'm sure a lot of them were probably not meeting the minimum speeds.....
K&N at Bristol had 18 cars, and almost all of them (with the exception of 1 or 2) were good competitive cars though 4 of them were Bill McNally's west series cars that wont be at all of the east races. DGR brought 4 cars (i think 1 or 2 of them are full time)... K&N East had as few as 13 cars at Thompson last year, West had as few as 13 at Oregon last year.
Taking all of the good competitive full time cars from all 3 series would make 1 full very strong field at a combination race, so i doubt there would be too many cars to send home anyway.
ARCA's in a rough spot now. Those super slow cars look kind of like a joke, either parking immediately or getting lapped within a few laps...(and getting lapped again constantly) but take them away and they have a 10 or 11 car field. Will be interesting to see what NASCAR can do to help the fields anyway. I'm not sure whats gonna happen but i'm looking forward to it anyway!