Nah. They see the writing on the wall. They're ready to throw in the towel. Smartphones have a GPSr built it - fine-tune it, add some bells and whistles, miniaturize everything, and guess what?! You got an all-in-one unit!
Seriously, right now you just download a widget and the smartphone displays the GPS readings.
In the year 2020 feel free to bump this thread - it will be a "provident" bump, so no need to tremble in your boots! - and we can confirm that smartphones have taken over more and more of the territory. By then they will interface with your smart-refrigerator to provide you an inventory while you're in the supermarket.
So Garmin and friends will either evolve quickly or go the way of the dinosaurs!
Sygic navigation does not have any problems with that at all! http://www.sygic.com/en/business:fleet