You must understand the architecture. Verizon is only delivering video to FiOS customers. So all the posts from DSL users do not matter. FiOS is their brand name for Fiber To The Premises (FTTP). They basically deliver a fiber optic cable to your home or premise. Over this fiber, they have 3 laser wavelenghts. One is for video and the other two are for the incoming/outgoing broadband data.
SO IT DOESN'T MATTER!!! Your data and video are separate. There is no overlap or oversaturation of video messing up your internet data or phone calls. Also, they are setting it up so that the video never travels across the public backbones. Only from Verizon's points of the physical networks.
So this is all completely bogus. Somebody is running their mouth when they don't have all the info.