If it's on the disc, you're entitled to it. You paid the 60 bucks for the content, and if it's buried in the disc, at that point, it's just content that is being withheld for more money. Hence why people are so pissed about the
From Ashes DLC being found on the Mass Effect 3 disc.
If I pay 60 bucks, I expect a working, optimized product, with all of the content contained on said disc. That is what I am entitled to as a paying customer, and a gamer.
Post-launch, it's completely up to the developers. I like to use the "pie" analogy, because it holds a lot of weight when talking about DLC and content in general:
Despite my feelings about Rockstar's lackluster PC ports of late, they understand how DLC is supposed to function:
It's content in
addition to the content you already have. Hence paying money for another pie, not the rest of your pie.