Yes. You're basically saying the equivalent of "why keep painting the bridge, I've never seen it rust!"

That's WHY you've never seen it rust.

Every new generation needs to be reminded of it.

The coca cola Christmas ad is well known I would say.

Brands can disappear much quicker than people think. Remember Nokia or blackberry

Blackberry was the thing for business people.

Yes, but the chain of events was different. People missed Nokia and Blackberry. Some still do. It is not as if Nokia and BB started putting less ads out and people began to forget them. They lost the technological race; something that doesn't apply to Coca Cola.

It was a more generic example how fast it can go.