Support will never go away
The business may save the cost of the hardware price but the support for company owned or BYOD devices will never go away. The user will always need some help along the way. Help-desk workers with an expanded knowledge of a variety of hardware will be "in-demand" as (in my experience) the environment is still not at a point where self-help (such as a online forum or blog) provides sufficient immediacy. Users do not want to browse through a myriad of posting to finally stumble upon one of significance. They need their issues addressed in as simple a manner as possible and a phone call for help is as easy as it gets.