I found the EOL dates to be very surprising. I have always assumed that Chromebooks would have a longer EOL than traditional devices due to the lighter weight hardware requirements and automatic updates of ChromeOS. I could be wrong, but I think many schools purchased Chromebooks with an expectation that the total cost of ownership would be less than traditional purchase due in part to a longer life expectancy.
The brand new HP models have an EOL of 2017, four years after their release date. Not bad for a traditional PC, but I expected more from a Chromebook. Perhaps my expectations were off. Google was also a bit vague about what "full support" entails. Perhaps this is more of a legal disclaimer. My CR-48 still runs although I'm sure it is well past its EOL date