No shark.

im sorry. many species that have existed before us have already gone extinct. I don't get the significance here.

Then it's Game Over, man

There will be a major reduction in shark attacks

blahaj nooo

More unstable fluctuations in the populations of other marine species.

what happened to you when your grandmother died?

Not much, more fish in the sea. Something in the depts will likely surface to take its place as the food abundance causes evolution to compensate.

No new content on Shark Week.

As they're a keystone predator, if they 'suddenly' go extinct, the hierarchy of the ocean would change dramatically. The influence on us would probably be negligible at first, but it would soon go to shit. Any sudden and dramatic change to a finely balanced ecosystem would be catastrophic. Over-population, numerous species disappearing, algae blooms, coral death. All the bad stuff.

You die