The first generation Acura NSX had 16" wheels back in 1990. Back then they had 'sex appeal', 22 years later; 16" wheels are typical sized wheels for standard cars, if anything they are conservative. Today's Prius, Corolla, Civic and Focus all come w/ 15", 16" & 17" wheels (based on selected options). It makes sense that if Nissan were to choose one wheel size that they settled for 16". The Leaf's suspension is compromised enough as it is w/ the way it wallows around, a taller sidewall would just make it worse.
The problem that most people have been experiencing w/ blown tires on the Leaf is the result of a poor quality tire being used as OEM.
2011 SL Superblack - Delivered 10/10/2011
"As an individual, not as the boss of a company, I am very interested in motor racing." - Carlos Ghosn
"Racing improves the breed." - Soichiro Honda