I will skip the whole sharing thing since we don't know exactly how taht was going to work, but it most likely would have been awesome. Here are some of the things I can think of.

1. Disc based games do not sync with the cloud or show up in your library profile

http://www.engadget.com/2013/06/19/xbox-one-drm-marc-whitten/

Going to a friends place to play Halo 5 which you bought on disc? You will have to have your profile on a USB if you want the controller profile or game save to be there. Your digital profile will not have your settings for this game available.

2. Fragmenting of a gaming library

Only digital purchases show up in your profile. If next gen consoles are backwards compatible or there is no next gen much like there is no "next gen" for PCs, your gaming library will be partly digital partly disk based. If disk drives go away, so does your gaming library

3. Digital purchases can only be made on xbox Live.

For those that want to avoid disks like the plauge (like me), they can not take advantage of Best buy and Walmart clearances of games to buy digital games. Retail bought games are locked to the disk and not my Xbox Live ID. Intead the only place we can hope to get deals from is Xbox Live marketplace. 

4. Disk swaps and verification checks for no functional reason other than to enforce DRM

Self explanitory. I'd rather have internet do something so I don't have to.

5. Gamestop and Publishers can keep screwing users with used games and passes

Gamestop loves the new direction Xbox One is taking. Wonder why...

http://gamrconnect.vgchartz.com/thread.php?id=163044

I agree with most of it, but Gamestop doesn't screw anyone. It's a genuine free market, you're free to go elsewhere for better value.

Am I the only one who thinks GameStop is a good company for gamers?

People have different experiences. Every time I go there to trade something I feel like I got raped by Pyramidhead.

How can you have me buy a brand new game at launch for 60 bucks and then say "its not a very good game....20 dollar trade in value" when I try to trade it less than 7 days later?

Thats why I stopped trading games. I have no time to chase people on craigslist and going to Gamestop and bestbuy is an insult.

I like the people and the vibe there. The trade in leaves alot to be desired though.

I really dont understand why some people think its a crime for the video game industry to have a 2nd hand market while alot of other industries do have a 2nd hand market and are thriving/ maybe some of these companies need to rethink their business models.

Microsoft just tried...

Ideally the trades would happen digitally directly between gamers with 15% of the sale value going to publisher and maybe 5% to Microsoft. 

1) you don't know that. Its very likely disc based saves and profiles will sync. You'll just need to bring your disc and login.
2) MS has already ended any hope for BC on its consoles. So this is a non-issue. Nintendo will likely follow suit next gen considering MSony both have.
3) Again you don't know that. You can buy digital slips for games for Nintendo consoles and I'm sure the same will exist for others... as well as just buying value based cards for redemption. Non-issue again.
4) Disc swaps... if you don't want to deal with a disc... don't buy one. All games will be available digitally. You can have the exact features you desire that way.

5) This is a massive misnomer on your end. This is why I've pulled it out from the other four.
Gamestop was a ripoff because people allowed it to be and traded/bought from them. If MS policies went through, these types of non-deals would be the ONLY choice you have as you were forced to use Gamestop/BestBuy/Amazon/Walmart/etc for trade-ins and used gaming.

However, now you have the real choice of still using person to person, Craigslist, eBay, etc. That is where the real deals are for used games anyways. Selling and buying a game is ALWAYS a better deal through person to person channels than any retailer. Better for the seller and buyer. Your want for MS policy would have destroyed this option and definitely cost resellers/used buyers more.

Trading in is something of a ripoff, yes, but I view it mainly as an option for getting a game out of your life ASAP while getting some compensation.

If it weren't for GameStop and their policy of pushing used products, I wouldn't have been able to start console gaming again back in 2007 for a minimal price. I wouldn't have been able to pick up all time classics for $20 or less despite my limited internet access at the time. It would be a lot harder to find gems of games that aren't carried by unspecialized new-only stores.

It's not a perfect chain. As already established, trading in games for money is not exactly a great way to make money, and it's annoying how they push you to preorder. But I couldn't have been the gamer I am today without them.

Can you haggle at Gamestop though?