Is it really the end? *Spoilers*

[Alleluia]

What prevents anyone from taking the form of a primal, like Shiva, and then just tempering everyone? Hydi is gone and with her the blessing of light that shielded us from tempering. Even if we still have it, anyone from here on out will not, allowing anyone crazy enough to just become a god. Yes there are the amulets now, but I don't they are perfect and tempering may still be doable with a bit of study. Anything you can make you can unmake and a shield is no different.

I don't think the Traveler's Ward/Blessing of Light is gone. I didn't see anything that indicated that it was a persistent effect sustained by Hydaelyn. And even if that was the case, our specific Blessing might be different than that of others since we had to basically reconstruct it in Heavensward.

You're right that no new people will get it. Though, since it was a ward that apparently has variations (per Venat's dialogue in Elpis), we might come across others who know how to cast it or something similar enough to protect against whatever corrupting influence people are facing in the future. Or we can recover the knowledge of how to cast it or something.