It's not the content creators who make money because of the current system, it's the distributors. HBO costs $30/month on my cable system by itself - but as little as $15 if I get other premium channels - do you think HBO is discounting me because I get Showtime too? Of course not, it's the cable company giving me a discount to upsell me more channels - but they're still making a profit at $15/month.
Without the cable company (i.e., the distributor) in the mix, if HBO could sell the feed directly to subscribers, they'd probably make as much by charging $15/month, after accounting for the internal overhead they'd have to incur for distribution (or farming it out to Apple, Amazon, and the like).
Look at digital publishing for an existing example of how cutting out the middle-man works out for the content creators. In the generic print model, the publisher prints books and ships them to a distributor (at the publisher's cost), for which the distributor given them approximately 35% of the list price of the book. The distributor then distributes (naturally) the books to warehouses/shops, selling them to the retailers at 50-60% of cover price. The retailer then sells the book at or less than cover price to recoup their investment and make some profit. (I'm simplifying, mostly with regards to unsold copies, but the main point stands.)
In the digital model, the recommended selling price is 50% of the print list price. The publisher typically gets 70% of the digital sales price with the storefront (distributor/retailer combined) claiming the rest as their cut (BTW, sounds an awful lot like Apple's 30% cut on iTunes and App stores, doesn't it?). 70% of 50% is the exact same cut as 35% of 100% to the publisher, and there's no worry about printing and shipping costs. The content creator is still getting what they got before, and with less capital investment.
So where are the savings coming from? The physical distribution chain is no longer necessary. The distributor/retailer might take a lower percentage per book sold, but they also have much less risk of unsold copies. So they're making their money too, again with less capital investment and risk.
Now, TV is a different beast, simply because there is no physical inventory like a printed book - it's all electronic distribution in the first place, after all - but the concepts still stand, even if the actual numbers change.