Everyone is on the right track….it’s all about exposure, there are only limited quantities. I remember NJN doing a segment at an EHT state race back around 1988 or 89.
They also had the 1987 Worlds from Orlando on Nickelodeon, which you can see on bmxvideos.net (an excellent race coverage site! by the way!!)
The closest we’ve come to “main-stream” as of late is when they had the Xgames in philly and did the super downhill bmx from woodward, PA.