The best replacement for ethernet is usb.

The best alternatives to ethernet are rated as following:
★★★★★  usb
★★★★★  token ring
★★★★★  wireless
★★★  wifi
★★★  fastethernet
★★  internet
★★  t1
★★  firewire
★★  fiber
★  atm
★  ip
★  ethernet
★  dsl
★  gigabit ethernet
★  phone jack
★  fast ethernet
★  wifi speed
★  thunderbolt
★  wifi faster
★  usb 3
★  firewire faster
  mpls
  coax faster
  hdmi
  tdm
  usb faster
  wifi gaming
  usb connection
  thunderbolt faster
  usb 2.0
  usb smoothstepper
  pppoe
  lan
  wireless speed
  coax
  ds3
  infiniband
  crossover cable
  sdh
  sonet
  wireless which is faster
  devicenet
  wireless n
  usb 2
  modem
  lan cable
  gigabit
  patch cable

Your alternative for ethernet is not listed? Suggest!
Speaking about ethernet, one probably shouldn't forget about router.

Other search terms related to ethernet and their ratings are:
★★★★★ router
★★★★ hdmi
★★★★ cable
★★★★ hub
★★★ microcontroller
★★★ tcp ip
★★★ pic
★★ avr
★ usb cable
★ 8051
★ modem
★ arduino
phone jack
You have in mind a companion for ethernet and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ethernet in all years. Click on graph for more.
ethernet
usb
token ring