I'm not fully sure how to interpret your question, but Bitcoin can disappear in a sense. If a wallet is lost, the Bitcoin is essentially lost. It will no longer be part of the active bitcoin economy as it is impossible to use.
He means bitcoin could possibly disappear in a sense its global he mean all bitcoin ecosystem would be gone. Its okay that you misinterpret the OP question, its better to read in the 1st page and understand fully what does he mean so that you would have an idea on what to post in this thread. Thanks