Users of mixi are increasing by 15,000 people / day

It comes out when the system becomes heavy. It is the one above which graphically shows how it continues to increase, and I tried to make it with Excel of Office 2007 β.

Mixi's CTO says "How did mixi deal with increasing traffic?": ITpro
http://itpro.nikkeibp.co.jp/article/NEWS/20060330/233820/

Started service in February 2004 (accurately March 4), only two months after April 2004, the number of users is 10,000, 600,000 PV a day. It was July 22nd 2004 that we exceeded 50,000 people. On September 16, it reached 100,000 people. On November 25th, it reached 200,000 people. And one year later in February 2005 the number of users reached 210,000 people, and in one year later in February 2006 it exceeded 2 million people. Currently over 3 million people. Of the 3 million people, 70% of the 2.1 million people are so-called active users, users who log in to mixi within 72 hours. On average it is spending 200 minutes per user, that is 3 hours 20 minutes for mixi. About thirty minutes a day or so.
That's why the amount of diary data of mixi that had been piled up was actually more than 100 million. There seems to be an increase of 500,000 new diary articles a day. Generally, it seems that 6 diaries are written in 1 second. To the number of comments it is quadrupled 24 times a second. It is no ordinary level anymore.

In other words, if you keep this pace ten years from now, the number of mixi users will be 57.7 million. It seems impossible to make 100 million total mixi everything.

When asking the users actually using mixi, it seems that new contacts have increased one by one from the hits exceeding 1.2 million people and "Quality gradually decreases". Is it still inevitable that the quality of the community declines if the number of users increases rapidly? Wonder, which mixi will be ceiling at the same time?