But if Nokia discontinues the distribution of certain files, we can't officially support the devices anymore. We are not legally allowed to redistribute the firmware images for example, so only users that already downloaded the files could reinstall.
But we are legally not allowed to redistribute a lot of files like firmware images and some packages (used inside the firmware image and installed when setting up a SDK scratchbox environment). That is a problem. So can we support the Maemo and MeeGo devices properly without those? If Nokia decides to simply pull the plug without proper warnings, they would make a lot of Nokia customers really angry, making it highly unlikely they would buy Nokia again. But Nokia has done stranger things in the couple years.
As explained in the announcement, the timeline for the cuts is between now and the end of 2013.