Sure, happy to respectfully disagree. The game's not similar to Diablo 3. If Bungie were attempting to create a similar loot-upgrade-progress-repeat system as Diablo, Torchlight, Borderlands, Marvel Heroes, etc. they would have quite failed, certainly, and Xur would be a horrible idea. But they aren't, and the things that will be needed to keep people playing are different (more content, the top line item by a long shot).
We'll just have to wait and see with regard to keeping people playing. I would nudge your attention toward the OT number and the page number up there in the corner as evidence in my corner.
edit: I just had a weird thought. Hawkmoon is the only exotic I cared about getting in the entire game. I have it. Am I weird for wanting to keep playing without that to look forward to...? I didn't even think about it until now.