I can't speak for NJC as to what kind of interest was expressed PRIOR to scheduling the class... but it was my impression there was enough INITIAL INTEREST to make it a go. It appears that once the class was posted, only a few actually confirmed. No doubt LOTS of members on the site, active and not so active are fully aware the class is posted.
Please keep in mind I was looking and willing to fork out a few hundred bucks for a junk car or two to make the class safer in regards to people using their own vehicle and risk damage... I actually found a running car and a non-running car at a reasonable price... I only have alternate weekends off so while you are correct, the date is still a ways off, I don't have that much time to prepare... my next weekend off, the date for NJC's pistol class, would have been the time I had to drag the cars up there... so for me, it was down to about a week for go/no-go... I hope you understand.
It just appeared after a couple weeks the interest was not what initially thought... so no harm in cancelling it... it's not a big deal, no feelings are hurt, if interest gets regenerated we can still hold the class... I think it would have been fun...