Well, almost no one, we mean. A new China-based manufacturer, called Manta, is currently developing a handset, which will sport absolutely no physical buttons on its chassis. There are not many details available on how this is going to work exactly, but we do know that at least one of the phone's sides will sport a sensor-bar, which will detect the presence of the user's thumb and adjust the phone dialer's keypad to be easily accessible with said finger. We would wager this same sensor would be used for volume setting – sliding up and down the bezel could be a comfortable way to accomplish this task. Others have speculated that the controls will be done via gestures on the screen – much like how Oppo's Color OS allows the user to set volume levels by dragging two fingers across the screen, or open a various array of apps by calling in a swipe-up gestures menu.
The phone will bear the name Manta X7 and its custom OS, built on top of Android, will be named MO7os. Hardware details are yet unknown, though, some speculate that the SoC will be a MediaTek creation. There's no announcement date set, too, though, we wouldn't hold our breath for an out-of-Asia release.
source: MTKsj (translated) via GSMDome