The best replacement for 802.11n is 802.11g.

The best alternatives to 802.11n are rated as following:
★★★★★  802.11g
★★★★  802.11ac
★★★  802.11a
★★  802.11b/g/n
★★  802.11ac range
★  fast ethernet
★  802.11b/g
★  802.11n
★  powerline
  wimax
  801.11ac
  802.11n draft
  draft n
  gigabit ethernet
  802.11b
  uwb

Your alternative for 802.11n is not listed? Suggest!
Speaking about 802.11n, one probably shouldn't forget about 802.11g.

Other search terms related to 802.11n and their ratings are:
★★★★★ 802.11g
You have in mind a companion for 802.11n and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of 802.11n in all years. Click on graph for more.
802.11n
802.11g
802.11ac