I can't tell if you're being sarcastic. In case you're not, I've been an Android user for years now, and that is most certainly not what it shows. The vast majority of people can't upgrade to Jelly-bean, because their device, manufacturers, or carriers don't support it or won't release the update for their particular phone. For example, the Droid Bionic was on Gingerbread with no way to upgrade (without rooting) until October 2012 [1]. And the upgrade was for Ice Cream Sandwich which was already 12 months old by that time (and Jelly-bean, the next version after ICS, had already been out for 3 months by that time) [2].
[1] http://www.droid-life.com/2012/10/23/droid-bionic-ice-cream-...
[2] http://en.wikipedia.org/wiki/Android_version_history#Android...