Yeah... I can see your point, but I think I put more weight on the view from the other side... The Model S proves to be practical because the day-to-day use of the car is way more convenient than a conventional gas car and this particular rare & extreme scenario, while a bit less convenient, was still achievable. This is to contrast your "devil's advocate" point showing that these extreme scenarios would be easier for a gasoline car (given our current infrastructure), while the day-to-day aspect is less convenient (getting and paying for gas all the time). I guess this is because I drive about 80-100 miles per day, which means I was getting gas every 3-4 days, and having to pay $4.50/gal at the pump, which means two fill-ups costs more than the Models S's entire month's electricity usage for the same number of miles. From my perspective, that is the definition of impractical...
And as you mentioned, if your wife were to do the trip herself, the Nav would've pointed her to the Supercharger. Still newb-friendly in the rare road-trip scenario.
I also think it would've been more humorous to title the post, "How TO convince your significant other...", because of your rhetorical "Ready to get a Model X?!" punchline... Don'tcha think? :smile: