If the NHTSA finds that Tesla's touchscreen interface is a serious distraction to drivers, even though the steering wheel also has controls that the driver can use, it's feasible that Tesla could remedy the problem by sending out an over-the-air update that disables the touchscreen while driving.
http://www.fool.com/investing/general/2014/01/26/is-tesla-motors-inc-on-the-nhtsas-hot-seat-again.aspx