That's the other factor that I have to consider. $815 dollars for a first generation device, while impressive, is hard to swallow knowing they'll get these features in the next round. And since it's something I cherish, I know I'll want to upgrade again. How well will the Pixel retain its value? Hard to say. Either way, I'd have to drop another ~$800 dollars again to get the waterproofing that should've been in this year.
That is thing with tech. I did the same thing you did with the iPhone 7. I kept thinking, why get the 7 when everyone is saying the 8 is going to be Apple's biggest upgrade and amazing. I am glad I decided to get the 7, I love it. Tech will always grow year over year, it's just one of those things you have to decide if that phone is worth buying now or waiting for the better one next year.