But what would happen if the oldest and most valuable asset on the market, Bitcoin, dropped to zero?
Such thing would happen only if an unrecoverable and very big problem would be found in Bitcoin. Until now no such thing has happened (the big problems were early and recoverable), so we can say it has already passed the test of time and 0-value scenario is pretty much unlikely.
However, was this a genuine question or just some attempt to advertise a website?
I agree with you, because in my opinion bitcoin will definitely be difficult to touch the zero price, because bitcoin has a lot of interest and there are even people who want to buy bitcoin and wait to buy at the lowest price so I think bitcoin will be difficult to touch the zero price, and the proof is now the price bitcoin is still stable and good, and that proves that bitcoin is strong.