The actual outcomes of cheaper distribution have been realized as less equal outcomes: the biggest hits are bigger than ever, the rest are part of an ever-increasing undiscovered long tail.
Even though distribution is cheap, when the product is consumable entertainment, you are competing on the basis of marketing for people's attention, which is a scarce resource. Capital can buy up attention through a variety of means:
* A saturation advertising blitz around release(as was realized with 1989's Batman campaign, and repeated countless times since). Rather than just release the product with a standard press kit, go all out: advertise a pre-event event, like a panel at a fan convention. Make secondary products that serve as loss leaders, each one creating a new advertising hook.
* Bundling and cross-promotional tactics(buy this new graphics card and get a free game!). When you have a large sales organization, you can afford the time and resources to negotiate complex deals of this nature.
* The inflated production values are the product: Avatar was a hit because it was a big, expensive, technically advanced production, and there are only so many of those in the world. Although it is a huge risk, this is the modus operandi of Hollywood blockbusters, AAA games, and many live acts.
* Franchise marketing: Instead of just having a piece of media, build a collection of IP adaptable to many mediums and release products for all of them, building a new hook for the brand with each release. This gives the same kind of effect as a saturation campaign, but is playing a longer game, and aims to make each release solid and more than a tie-in(e.g. why is Avengers: Endgame a record breaking hit? It's because it's the capstone to a decade of Marvel movies that build up to this moment, all using a consistent style and maintaining a similar level of quality).
While it's true that you don't have a definite formula for success, the quality of the result is a thing you can control for in some degree just by hiring people with a track record(another avenue of capital: buy the visible superstars), and then providing them with this marketing infrastructure to work within.
So I don't see an escape from these tactics without a change in the rules of how to capture human attention. Brand building for pop culture is a hugely expensive exercise, and this has made for a market that fights tooth and claw to get a small promotional edge. But like with other lines of business, waves of opportunity come and go that allow new products to get through, and Game of Thrones is one such example of the wave of "prestige TV" that appeared around the end of last decade.