The best replacement for 40k is fantasy.

The best alternatives to 40k are rated as following:
★★★★★  fantasy
★★★★★  star wars
★★★★★  starcraft
★★★★  warmachine
★★★  star trek
★★  mass effect
★★  warhammer
★  flames of war
★  30k
★  warhammer fantasy
★  dune
  fantasy more popular
  starcraft 2
  wfb
  starship troopers
  reapers
  fantasy battle
  warcraft

Your alternative for 40k is not listed? Suggest!
Speaking about 40k, one probably shouldn't forget about number rule.

Other search terms related to 40k and their ratings are:
★★★★★ number rule
★★★ infinity rules
You have in mind a companion for 40k and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of 40k in all years. Click on graph for more.
40k
fantasy
star wars