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.

Purely speculation of course, but based on what they've been up to since letting go of the reigns of Google: because squeezing every possible drop of revenue out of the product helps fund the things they're now more interested in engaging in (self-driving, longevity, etc.)

The cynical assumption would be that they're just sitting on the extremely vast hoards of money and greedy for more. The (slightly) less cynical assumption is that their interest in Search nowadays is as a piggy bank for projects they consider more important.

Worth noting though the latter has long been the going assumption internally at Google: Search was the cash cow that funded Google's expeditions in finding the Next Big Thing. This plan has been complicated by the appearance that Google seems to not be terribly good at the kind of product execution that would lead them to the Next Big Thing.