At the height of Win XPs popularity what was its market share? Over 90%? I'm sure plenty or users with lots to protect used XP which was a malware magnet. Did all those people lose what they had to protect? Was there a world financial collapse because hackers robbed everyone? No. So if it didn't happen back then it's not going to happen now.
There was a highly publicized tug of war between India and BB a few years ago in which India insisted BB install a 'backdoor' so that the Indian government could spy on its citizens.http://betanews.com/2010/08/03/rim-no-back-door-into-encrypted-blackberry-messages-for-any-government/
Again those unlimited data plans were not 'grandfathered'. Verizon does not allow anyone with a unlimited data plan to sign another contract with unlimited data. All those that still have unlimited data are either still using the same phone, bought a used one, or purchased one at full retail.