I had similar feelings when Ken Kutaragi and Phil Harrison left. And then I was worried when Jack Tretton, Adam Boyes, Andrew House left. However then there was still Yoshida and Shawn...but now Shawn is gone.
And I honestly haven't seen any of the people who have replaced them have any interest in being a "personality". Which is probably why they are shifting from conferences like E3 and even their own PlayStation Experience.