Mikrotik has builin cdc ethernet driver for LTE modems, also refered as EoUSB. This driver compatibale with a lot of devices working with RNDIS driver bilt in Microsoft Windows ( since 2002 year). There are hundreds of devices like smartfones ( 3G/4G), WiMAX Modems and LTE Modem compatible to them. LTE at this moment is ony small part of this amount, very important part of course.
It would be nice to add support some kind of “General Usb over Ethernet” at all. Developers just need a ny Android smartphone like HTC Desire.