Some of you guys really need to stay in your own lanes, because you are making yourselves look extremely ignorant talking about topics you clearly know almost nothing about.
For one thing, NASCAR IS oval racing. Of the 36 races scheduled for this year, 34 are on ovals. Ovals are not going anywhere. Also, some of you are over simplifying what oval racing is. At most ovals, the drivers are not simply going flat out the entire time. Daytona and Talladega are unique in that drivers simply pin the throttle and steer. Most require at least some lifting, and some do require braking. At almost every other track the cars do not maintain speeds like they do at Daytona and Talladega, and they also do not run in big packs, which is the heart of the problem. At other big tracks like Auto Club Speedway and Charlotte Motor Speedway, the field tends to spread out, making accidents less frequent, and they allow the drivers more opportunity to avoid the wreck.
Oval racing is popular in the United States for several reasons. For one, like I said earlier, it accounts for most of the racing that goes on in this country. It also allows you to follow the whole race, rather than just a series of corners. It also creates a feeling that the drivers are racing each other, rather than the track. Oval racing facilitates a much more "man on man" type of racing that generates a feeling that anything could happen. Your driver is always one adjustment or one yellow flag from getting back into contention for the win.
Also, someone mentioned putting spectators inside the tracks. This already happens. There is a huge culture of camping in the infield, however infield seats suck because you cant see anything. At Indianapolis they have a grandstand on the infield on the front stretch, but it sucks because all you can see is the track directly in front of you, defeating one of the great things about oval racing. Most track owners are also not in any economic position to build 80,000 new seats inside their tracks. There also short tracks like Martinsville and Bristol that barely have room for the teams' haulers, let alone grandstands full of fans.
Like I said before, move the fans back and away from the action, and your problem is solved. Well, that and eliminating the pack racing at Daytona and Talladega.