Im sorry if this sounds cold, because I agree with you, but I feel like it would take ALOT to ever get something like this off the ground let alone profitable enough to make sure it survives. It would take a massive injection of money by the biggest companies to create something that people would even look twice at sadly.
The closest thing to what you are proposing would be the failed OUYA console back in like 2013. It didnt invest in physical media, but it did want a store where indie developers can market exclusive games with the same hopes you had where it would get big enough to gain the attention of bigger companies. I invested in the kickstarter and had one, it was cool but needed a lot of work and fizzled out when it became clear that they were not going to make money off that model as there were not enough quality games being made to keep it afloat. On top of this the handful of really good games just ended up being ported to Steam, Switch, and even PS or Xbox which meant why bother at all buying it on OUYA. I think the biggest successful game that they had first was Towerfall.