The best replacement for wmv is mp4.

The best alternatives to wmv are rated as following:
★★★★★  mp4
★★★★★  avi
★★★★  mpeg
★★★  mov
★★  mpg
★  divx
★  mp3
★  mpeg4
★  wma
★  h.264
★  mp4 quality
★  flv
★  mp4 better quality
★  avi better quality
  mpeg2
  mpeg 2
  mov which is better
  mp4 size
  mpeg-2
  mp4 smaller
  avi which is better
  mp4 which is better
  mpeg which is better
  xvid
  mp4 file size
  avi bigger
  mkv
  h 264
  mp4 better
  .mov
  asf
  avi better
  mov quality
  mpeg quality
  avi quality
  quicktime
  avi file size
  avi which is smaller
  wmv9
  h264
  avi files

Your alternative for wmv is not listed? Suggest!
Speaking about wmv, one probably shouldn't forget about drm license.

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



Google Trends

Scale is based on the average worldwide traffic of wmv in all years. Click on graph for more.
wmv
mp4
avi