LP's 4 studio albums, from HT in order to ATS, have come out in 2000, 2003, 2007, and 2010, respectively. That puts LP's release years of studio albums at about every 3 years. So, they have been pretty consistent in that way to have just four albums out. If that is the case, then we can probably expect their fifth studio album in early 2013 or late 2012. I say we let them tour around the world to promote their new material, take a break, start writing and then begin recording, release the album, and then tour again. It's a much better idea I think than to have them just put out two albums in a single year and skip touring in between. Fans want to see them! Just my two cents.
I think this not the number of CDs that count but the quality.
Linkin Park is a group that takes the time to really listen and adapt to its fans.
This is one reason why I like them both.