Do you honestly believe... that if the Aura, G6, and Malibu had NAV suddenly people would stop buying Camcords?
As of September 2007 Toyota has sold 365,140 Camrys and is on pace to sell 438,168 this year.
G6, Aura, and the old Malibu sold 270,659 copies and are on pace to sell 324,791
G6 110,473
Malibu 102,955
Aura 46,062
Old Malibu was good for around 203,503 at it's peak. I'll bet money that the new Malibu is good for at least 250k in it's first full year. So if the Aura ever gets off it's ass and starts selling at the intended 100k per year, the epsilons will overtake Camry. If you're looking to point a finger, point it at the Aura, because the Malibu has been holding up it's end of the bargain. I'm not saying that GM shouldn't offer NAV. I'm saying it's not going to seriously effect the sales of the car. The Fusion, Milan, Taurus and Sable offer NAV. Ask Ford how that's working out for them. As bowtiedude mentioned, things like a manual transmission are much more important to offer.
But wait, there's more. The current LaCrosse outsold the ES in 2005 and matched it in 2006. Sales are tanking in 2007 because it's been beaten with an ugly stick, but once the EpII model comes on line, all it has to do is match the 2005 sales numbers to outsell the ES.
In 2005 GM sold 502,216 W-bodies. Toyota sold 498,980 Camrys, Solaras, and ESes.
That's right.... the old W-body. Oldest platform in GM's lineup... and not even offered with NAV, outsold all of the Camrys, Camry Coupes, and Camry De Luxes combined.
But apparently I'm too thick to look at the numbers.