1. Evidence that it's the "hottest selling phone"?
2. The Nexus is a niche line, and always has been, for technophiles. The common person will just jump on the Samsung, Apple, or maybe HTC bandwagon. Previously, you had to buy the Nexus 4 unlocked, which just isn't that appealing for most people. Now, you can get it subsidized for a truly awful deal, saving only $200 or so. Still, people won't get this new "nexus" brand all of a sudden, they'll jump on the bandwagon.
3. The specs have always been impressive for the price. But a 1080p screen and wireless charging sacrificed one thing: Battery life. That screen sucks the battery quite a bit, and without wireless charging, they probably could've fit a bigger battery (maybe 3000mAh?). The Nexus 4 was no battery champion either, but compared to the G2's battery life, and considering how most people flock to subsidization deals, the G2 will look more appealing than the Nexus 5. Of course, the Samsung/Apple bandwagon is more attractive still. And anyway, consumers will just look at the rated life of phones and go, "hurr durr" and buy the one with claimed 15 hours.
4. The specs. Yes, Snapdragon 800 is fast, but do we need more speed? The S4 Pro in the Nexus 4 is also a fast chip, on 28nm. It's kind of hard to get performance/power improvements on the same process. Without panel self-refresh, the 1080p screen will tax the powerful CPU, draining the battery more. We've had 28nm for two years now, and 20nm is pretty close, which will make the 28nm generation look pathetic, as 28nm did for 40nm.
I guess my point is that the Nexus 5 is a good phone, especially considering the price. But it's not perfect. Nor are other phones perfect, but a good phone from Apple/Samsung will always be more attractive than a good phone from the niche LG making the even more niche Nexus. Consumers simply have no space for this phone right now. It would need to be perfect to have a chance to be the "hottest selling phone." Snapdragon 800, a 1080p screen, and a 2300mAh battery for $350 would be amazing a couple months ago. Now it just falls in the shadow of others. Too little, too late.
It makes no sense to say this: I have a Nexus 4, and before that I had a Galaxy Nexus. This is irrelevant, but I don't want to wast time replying to claims that I'm some "Android hater" or "Apple fanboi." I will be keeping my Nexus 4 until the next iteration of the nexus series on 20nm.