Answer me this, can you do any of that with Steam?
Actually, similar things have been proposed and rumbled around Steam for a while now. In fact, people digging around in a recent beta found this:
It seems inevitable that they will arrive, especially with other marketplaces starting to provide real competition. Which neatly leads me to...
A purely digital market place would hopefully see game prices come down significantly much like they did on Steam and have on Origin!
Nnnnnnnnnnnnnnnnnnnnnnnope. Think about it. Xbox would have one marketplace, and you'd be tied to it. What in ten hells is the incentive to reduce prices? Steam, Origin, GoG, GMG, etc reduce prices and flash sale products because they have to compete with each other for your dollar. Steam used to be way more expensive than it is now, but the emergence of other marketplaces led to their aggressive pricing. Now, what competition is there for that on Xbox?