Will Sony, Microsoft, Nintendo, Valve and another software store have to allow mini stores on their platforms? That's to say software with its own payment system, inside of a free app?
It'd be useless because you don't have a Dev kit at home to do this with. You can't just pay $100 and get access to the Nintendo SDK.
And I don't think any of the big players are interested in fracturing consoles. Consoles change every 6-8 years so it's a moot point.
One can only hope.
Valve already provides a store inside someone else's platform.
Valve doesn't restrict how you use their devices so you can install whatever you want on them already.