You know, maybe you should check a few things out before panicking. NASCAR
likes airports and they like having their tracks close to an airport.

Yes, there is the stadium TFR, but those TFRs allow traffic that are landing
or departing from an airport. Boeing Field does not close when there is a
game in Seattle. Neither does Daytona close during the race there.

I think it would be better to check out what the actual effect of any TFRs
would be before going into a tizzy on this one. The track might just be one
of the best things that ever happened to Arlington.

Have you talked to the FSDO and AOPA what the effect of the track would be?