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Frankly, I think it is inevitable, and it is easier to embrace it with reasonable security measures than to try and ignore reality (unlike about 10% of companies that know employees are BYOD anyway, but continue to forbid it). Of course there are some occupations where I would be flatly opposed to allowing BYOD, so if you are working at CIA headquarters, doing nuclear research at Los Alamos, or managing Mitt Romney's Swiss bank accounts, no iPad for you!
I read about Unisys coming around to this view a year or so ago. They did two things to allow BYOD and still retain a layer of security. Employees were required to install security software with an authentication certificate so there was a record of device usage along with remote wipe software that would allow company data to be deleted in the event a device was lost or stolen.