A good idea doesn't equal a good business

Sezmi has me excited & nostalgic. I was captivated by the idea when it was USDTV. That company's long gone, but the idea of using wasted bandwidth of broadcast stations still intrigues me.
I have so many ...I don't want to call them bad... let's say "underutilized" ATSC TV stations around me, I'd love to see someone buy up all those excess bits & do something useful with them. I count 5 stations doing SD with no subchannels. I would imagine that could carry a lot of additional content if someone would just lease the bandwidth. It would be additional income for marginal broadcasters, and more programming choice for viewers.
Let's hope someone finds a successful business model, so this can actually get done.