Assuming you meant Xbox 360 and PS3, I think your stats are off:

    * Steam - ~60 million [1]
    * Xbox 360 - ~80 million [2]
    * PS3 - ~80 million [3]

If you literally meant the Xbox and PS2 from 11 years ago, then yes, you are probably correct :)

  [1] http://en.wikipedia.org/wiki/Steam_(software)
  [2] http://en.wikipedia.org/wiki/List_of_best-selling_game_consoles#Microsoft
  [3] http://en.wikipedia.org/wiki/List_of_best-selling_game_consoles#Sony

That's an unfair comparison. It should be with XBox Live [1] and PlayStation Network [2]

    * Steam - ~60 million users
    * XBox Live - 46 million users as of February 2013
    * PlayStation Network - +100 million

although PSN includes PlayStation Portable and PlayStation Vita handhelds so the number of PS3 users is probably similar to XBox given the number of consoles sold.

Also, the Steam page you referenced says: "Steam has an estimated 50–70% share of the digital distribution market for downloadable PC video games"

[1] http://en.wikipedia.org/wiki/Xbox_Live [2] http://en.wikipedia.org/wiki/PlayStation_Network