NO. The gig phones are meant to provide Gig to the desktop PC connected behind it, use one cable, use one switchport.
People using medical imaging, CAD, graphic artists, video processors, etc that take a LOT of bandwidth usually have gig to their desktop and would benefit from the phone.
Also those purchasing today for the 1, 2, 5 year plan might consider gig phones.
You can have good voice quality on a 128Kb link when QoS is properly configured.