I really wouldn't say it is entitlement. More a missed opportunity.
Let's be honest here, all the consoles of this generation are lacking in terms of the number of exclusive titles for each of the consoles. The PS4 and Xbone each only have about a handful of such titles, most of them overly hyped, and relatively disappointing releases. While re-releasing old games isn't the same as new ones, it does still build value to the console since it is something that can be played on the console between major releases.
If Sony went and said that people could play their PS3, and PS2 games they already own, or have bought from PSN, it would have done something far beyond what Nintendo or Microsoft are doing. Furthermore, it would completely diffuse most of the "greatness" of Microsoft's plan to re-release original Xbox titles for the Xbox One. It would be giving existing customers added value, and adding more incentive for new customers to buy into the PS4. Instead of people re-buying games they already own, they would be more inclined to buy games they don't, meanwhile a single action would have brought several hundred games to bolster the the lacking PS4 library.