I don't know about that. I don't think it will ever go to zero. For one thing, even when the media decides that it has failed to catch on and declares it dead, there will stil be true believers mining and collecting coins. Bitcoin will forever be an important part of history, and there will always be people who want a piece of it.
The media declared Esperanto dead about 75 years ago, but today there are still about 100,000 people around the world who speak it, think it's a great idea, and still hope it will eventually succeed. 100 years ago people were probably saying that in 100 years either everybody would speak it, or nobody would, but they were wrong.
If the media declared today that Bitcoin had failed and should be abandoned, would you stop mining and delete your wallets? How long would you continue to be a supporter?