I cannot speak about US prices , but here in Germany I wouldn't want to pay more than 700€ for a phone. The Pixel XL with 128GB is 1000€. I am sorry, but it is not worth it.
If I decided to get the Pixel, then it would be only the XL model. Since there is no 64GB option, I would have to go with the 128GB model. This costs 1007€ here in Germany. Selling my HTC 10 would bring me 400€ tops. The answer to the question if the Pixel xl is 600€ better than my HTC, is a clear no. Actually the HTC is the better phone.
If I compare the Pixel to my HTC 10, then I would have to see that the Pixel has a lower resolution AMOLED display (which sucks because of the viewing angles and Pixel density/placement), compared to the 2K LCD Display of my HTC.
I would have to ignore the fact that the sound quality will be worse, especially from the bottom firing speaker.
What would I get for my money? A good , solid phone that will always get updates in a timely manner. The Google Assistant is not something I consider, since I have it in Allo and since Google Now is actually doing more or less the same things. The Google storage is also not important to me.
Another problem is that the Pixel has a 5" display, compared to the 5,2" of my HTC 10. Add to that the space taken from the soft buttons and you have much less usable space compared to my device.
How can I ignore these facts and say yes to the Pixel? I see zero advantages and many disadvantages.
HTC will also deliver updates for the next two years, so I don't worry about that too..
Next year, when the Pixel 2 comes out, I will consider it.
I love Google and its great software, but I will pass on that.