The penetration rate between HDTVs and PCs are close. But just because there is a PC in the home, doesn't mean the kid can use it to learn (i.e. it may be a single PC for the whole family to use).

2010 HDTV US home penetration: 65% [1]

2006 PC US home penetration: 73% [2]

[1] http://www.bizjournals.com/washington/stories/2010/05/03/dai...

[2] http://www.zdnet.com/blog/itfacts/us-pc-penetration-is-at-73...