Take a look at the TMS lawsuit regarding how it got its races. Also look at the Kentucky Speedway racetrack, not to mention the one built by Rusty Wallace in Iowa (?). It took years for TMS to get a second race, and had to buy a track to get the first race. It seats right at 200,000 and is sold out every year. Yet if IMS wants to put in a track and wants a race, well, IMS is tied at the hip to NASCAR, so, sure, it's going to get a race, at the expense of some other track.
If a track is not built by IMS, you can essentially forget about getting a NASCAR race. This is not "Field of Dreams", and if you build it, NASCAR is not necessarily going to come.