In a nutshell, this shows one reason why the iPhone (and iOS) are so popular.
Disagree. This may drive popularity in a small number of people (geeks especially), and people who belong to groups where there's a feature expectation (Apple advertises it's new features so people expect to use them), but the vast VAST majority of Android users simply don't give a shit.
I personally know about 6 people who simply haven't updated their phone because they don't want to, don't see a need to, and have been burnt in the past (my girlfriend complaining that the WiFi icon no longer changed colour to indicate internet access state with KitKat). You go talk to iOS users and they know why they are updating, they know there's a benefit.
Me? I run the latest and greatest on my phone but I can't even answer the question of why. What did 4.4 bring over 4.3? I don't know. May have been a bit smoother, but that may have been due to a factory reset. What did 5.0 bring over 4.4? A completely redesigned user interface which does the same thing in a different and arguably more complicated way. When your biggest selling feature is that you need to re-learn how to use the damn phone then there should be little wonder why people aren't upgrading.
There are reasons why iOS is popular, but upgrade cycles is definitely not one of them.