Supporting a two year old phone might be important to say X% of users, but I'd argue that Android phones include features that are important to Y% << X% of users.
My girlfriend cares way more that her 3GS runs iOS5 than she does that it doesn't have a 4.5" screen.
What does iOS 5 do that she actually needs? My nontechnical friend anecdote is the opposite: she likes the big screen and Swype on the Evo, and doesn't care what OS point version it's running.
My girlfriend cares way more that her 3GS runs iOS5 than she does that it doesn't have a 4.5" screen.