I don't understand why people are so sure that they will. (I think the argument boils down to, "Because Steam!") If they are refusing to be competitive with the prices of new retail games and digital downloads with used games supposedly eating their lunch, then I really doubt they are suddenly going to cut prices to the bone when digital is your only option (and on a closed platform, no less).

What makes you think that these developers are money hungry? Many of them are just doing what they need to survive. Developers who take risks are closing down left to right such as team bondi. They are just doing what they need to succeed. Episodic content is used to keep gamers from selling their games. Of course this may not be true for all developers, but it is unfair to group them all together as being "evil".

Machiavellian said:

Here is my scenario

MR. Z goes to gamestop and purchase a game.  
Mr.Z finishes the game in a week
Mr.Z sees poster from Gamestop saying "Trade in this game for instore credit"
Mr.Z goes to gameStop trade in game, Mr.Z thinks about getting a new game but there is another poster saying 2 for 1 used game purchase.
Mr. Z goes for the deal.
Clerk says if you get this powerup card, you get 10% on used game purchase and your purchase today goes towards points for rewards on teh website.  Also you get game informer for 75% off.
Mr.Z thinks thats great and sign up.
Cleark ask MR. Z if he has any games on this list that he could get 50% more for his trade in.
Mr. Z looks at the list and see a number of games he has he can trade in
Mr.Z bring those games in trade for instore credit and then client says, you can use your rewards to get 5% discount on a used game.

Now MR.Z is no longer thinking about purchasing a new game because Gamestop has made purchasing used a better proposition.

I probably would go on and on but this is the experience I have seen at gamestop more than the hypothetical one you present.  I have seen your argument from a few people but I highly doubt that it’s the norm.  If you sell your game to someone, you probably going to spend it on a bunch of different things and a new game is probably on a list of hundreds with a used game above the new if its cheaper.  The facts are that used games are a billion dollar industry where companies like gamestop makes huge profits from.  If gamestop is making those profits then someone else isn’t.  You couple that with grocery stores, and every other outlet selling used games now things start to become a problem.  When the scale of used games was small, your scenario definitely probably helped the industry but today such things have changed and every retail outlet is looking to make money like Gamestop.

If a game already sells millions of copies and there is additionally DLC for around 30$, that goes only into profit. They could have done profit with adding the DLC into the full game, but they don't.

You are right, there are many devs who need the money as basic income, but there are also many devs, that use it to make even more money. This generally goes with the big publishers.

My post was mostly inspired by the fact that I am seeing significant stagnation and repetition in gaming and the number of AAA titles I have desire to play is becoming smaller every year. With the way next gen is starting, I am not seeing any signs things will change. Looks like next gen is going to be about massive day 1 sellers that ride the hype train, and indie titles that do great things but don't have the budgets. 

Its important enough for you to create an account here and talk about it for more than 13.000 times

You have absolutly no proof that used games sells subsidize new game purchase. That is just as much an opinion as the OP. If you just sold your used game and right there was a used game and a new game why would that person purchase the new when he can save some coin and purchase the used. Gamestop gives you nothing for purchasing new but they have all kinds of incentives for you to purchase used.  I should know because there have been many times I would go into gamestop to get a new game but be offered the used.  They would say, "with the used game you get 14 day return", You get powerup rewards and in store credit etc.

Maybe in the past, used game sells used to subsidize new game purchase but the market and the retailers have changed.  The retailers have built a business on used over new compared to how it use to be in the past and it has hurt the industry.