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Explain to the CEO in the most simple manner what impact it would have, security, bandwidth etc.
oh, and dont forget reliability, a wireless network will go down (for random reasons) before a wired one will.
i like to explain bandwidth by comparing it to traffic (being in california, its an easy way to do it)

also i would see who uses more bandwidth in the company and make sure they get wired and lighter users get wireless

hope that helps.