The best replacement for wii fit is wii fit plus.

The best alternatives to wii fit are rated as following:
★★★★★  wii fit plus
★★★  kinect
★★★  wii active
★★  ea sports active
★★  active
★★  wii fit u
★  ea sports active 2
★  ps3 move
★  wii
★  ea active
★  xbox kinect
★  xbox 360 kinect
★  biggest loser
  your shape
  plus
  wii fit plus balance board
  ea sports
  just dance
  fit plus
  active 2
  my fitness coach
  playstation move
  sports active
  ea active 2
  wii sport
  wii sports
  kinect fitness
  wii fitness coach
  wii biggest loser
  yourself fitness

Your alternative for wii fit is not listed? Suggest!
Speaking about wii fit, one probably shouldn't forget about balance board.

Other search terms related to wii fit and their ratings are:
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★ wii u
★ console and balance board
★ mat bundle
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wii fit
wii fit plus
kinect