The best replacement for wpa2 is wpa.

The best alternatives to wpa2 are rated as following:
★★★★★  wpa
★★★★  wep
★★★  wpa2-psk
★★  wpa-psk
★★  wpa2 enterprise
★  wps
★  wpa personal
★  aes
★  radius
★  wep speed
★  wpa psk
★  wep security
★  wpa auto
★  802.1x
★  wpa2 psk
★  wpa wpa2
★  wpa/wpa2
★  wpa enterprise
  wep which is more secure
  wpa which is better
  wpa mixed
  wpa 1
  wep which is stronger
  wep 2
  tkip
  wpa2 personal
  wpa2-auto
  802.11i
  psk
  wpa security
  peap
  wpa2 auto
  wpa faster
  wpa/wpa2-psk
  psk2
  wpa2

Your alternative for wpa2 is not listed? Suggest!
Speaking about wpa2, one probably shouldn't forget about tkip.

Other search terms related to wpa2 and their ratings are:
★★★★★ tkip
★★★ wps
★★ wpa_supplicant
★ mac filtering
You have in mind a companion for wpa2 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of wpa2 in all years. Click on graph for more.
wpa2
wpa
wep