No-one is obligated to upgrade software.  Yet.  Perhaps down the line our government will require that we all pay up to Microslut for our yearly bread and butter.  Since companies are now people too, I could see that in the future.  

Until then, it is up to Eon to dangle a very juicy carrot in front of us all in exchange for our coin.  Whether or not you think the carrot is worth the coin, will be up to you.  I could wait another 4 versions before I have winkled all the goodness out of 8.4. :) 

*Edited to correct typos