The best replacement for usb is firewire.

The best alternatives to usb are rated as following:
★★★★★  firewire
★★★★  ethernet
★★  esata
★★  usb 2.0
★★  sata
★  ps2
★  pci wireless
★  firewire speed
★  pci wireless adapter
★  firewire audio interface
★  hdmi
★  thunderbolt
★  pci
★  lsb
★  analog headset
★  usb2
  flash drive
  firewire faster
  micro usb
  ethernet speed
  midi
  pci wifi adapter
  parallel
  pci wifi
  spdif
  xlr mic
  3.0 usb
  usb 2
  bluetooth mouse
  external hard drive
  serial port
  mini usb
  1394
  3.5mm
  ethernet connection
  firewire 400
  firewire 800
  ethernet faster
  aux sound quality
  serial
  ethernet which is faster
  ps2 keyboard
  firewire interface
  ps 2
  sd
  ps2 mouse
  ide
  scsi
  pci network adapter
  serial cables

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

Other search terms related to usb and their ratings are:
★★★★★ ipad
★★★★ cable
★★★ headphone jack
★★ pop port
★★ bios
★★ dos
★★ root
★★ hdmi cable
★★ wifi
★ virtualbox
★ ejecting
★ bluetooth
★ session software
★ lanyard
charging
rca cable
sd card
memory card
audio jack
mp3 player
You have in mind a companion for usb and it is not yet here? Propose!



Google Trends

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