Activision trying to find out how fast they can kill Guitar Hero franchise?

[NJ5]

Number of console Guitar Hero games per year:

2005 - 1 game

2006 - 1 game

2007 - 2 games

2008 - 2 games

2009 - 5 games

Why so many GH games in 2009? How long can they continue milking the franchise before people start getting desensitized to the Guitar Hero name?

I'm also wondering how many GH games we'll see next year...