Your best bet is to look at other successful tracks and see what makes them successful. Many tracks start out with plenty of business because they are new, well-maintained, and satisfy some pent-up desire for racing in the area. However, they slowly (or quickly) degrade over time as poor business decisions, bad management, or lack of upkeep fail to keep people interested in returning.
The two successful tracks that I go to here in SoCal have on-site hobby shops, an established and professional web presence, professional and knowledgeable staff, and maintain their facilities very well. I race on-road at TQ RC Racing in Chino, and off-road at OCRC in Huntington Beach.
The last thing that families want to deal with are shady, dirty facilities, disinterested or creepy employees, and an unfriendly atmosphere that people of all ages use for a babysitting service/escape from supervision. You can put in all the extra stuff that you want (restaurant, video games, etc), but if the core business is not appealing, chances are those things are not going to save you, and are probably being run at the same sub-par level as the main focus - the RC track.
You also have to take into account the population base near you. Everyone knows "a bunch of people who want a track," but the reality is that only a very small percentage of those people will repeatedly come back and invest the time and effort to make it successful. Even here in SoCal many tracks have failed, and there are millions of people here and great, year-round racing weather!