That's never easy, though. Just like newspapers before it, TV show creators will discover that internet advertising doesn't attract anywhere near the premiums of TV advertising.
So you have to find alternative revenue streams, which isn't always easy.
I've wondered for a while if the price for television advertising was/is inflated due to the fact that there's no way to track its impact. Web advertisements usually pay per click these days, which at least measures some kind of engagement, and yet advertisers apparently pay significantly less for it in aggregate than they do television advertising, which seems backward to me.
So you have to find alternative revenue streams, which isn't always easy.