Lord only knows but here's my guess:
 
Some more "desperate attempts" for action such as Cup dirt race(s), more road courses, and maybe a rule that limits length of green flag runs.  Brian France builds a Superspeedway.  Much more ticket variety at tracks: Standing room on backstretch for $20, Luxury box with bar $300.  30-40 cars each race in Cup, 20-30 in Nationwide and Trucks.  NASCAR gives up and sells or disbands K&N and Whelen tours.  Hometracks program will still exist, but just weekly short track racing.  Tracks begin to enter 21st century and become more like baseball/football stadiums with stadium seating, varied food options, more luxury boxes, and a few regional transit options.  The Earnhardt dynasty ends and Nascar tries to find a new poster child.