According to color psychologist, Carl Renbaugh:
It is very detrimental to one’s psyche when one suffers the loss of an important color in one’s life. Adult Fans of LEGO have been living with extreme psychological anguish for a number of years now. Reinstating these colors is a very compassionate move by The LEGO Company.
So, there you are, people. Old grey is alive and well!
Update (April 2): April Fools!