Sometimes sponsors don't renew because after a few years, it may see diminishing returns, which dictates a change in direction. Doesn't mean it wasn't successful. Like Bruce said, nothing lasts forever, especially in today's world. The internet already has a bunch of negative nellies declaring the end of NHRA, it's really insane. CW gave a pretty good headsup about their intentions, meaning there's a lot of runway for NHRA to find a replacement. Keep in mind, NHRA has attracted some really influential people lately, such as Tony Stewart and the Maynards, who have pretty stout Rolodexes (remember those?), so you never know where the next intro to the next partner may come from.