It could and did sustain.
That's just the thing. In it's day, anytime the gates opened for a NASCAR Cup or Busch Series race, it played to a packed house.
Even the weekends they ran the Dash cars, Modifieds, Late Models, and Street Stock (Bowman Gray Stadium type 6 cyl)
They would pack the front grandstand and twice the crowd in the infield (racers and crew)
The ONLY reason it was sold is New Hampshire Speedway was about to open with NO available Cup dates.
So they bought NW and shut it down just to get the race dates. Took them 10 years to make money from what the spent on NW
Had it stayed open ..... it would still be packing the stands, it's a great size to race on and one of the few tracks where you can see everything from every seat.
Everyone talks about Martinsville, but I think NW had a better show with higher speeds because of the basic design ...... Not just two dragstrips connected at each end.
I've seen 4 wide racing going there.