The man who killed Google Search?

Question : Why larry and brin not caring about it ? They built one of world's best and biggest company and it's dying . Even if they did not care about that , their money is still tied to google stock right ? That should raise some concern from them.

I can imagine this happening in many places: 1) Idealist phase. 2) Hype phase. 3) Novelty wears off = Leave. 4) Bean counter phase. 5) ???