you can't shut down something that is decentralized and make it disappear as long as people find it useful and continue using it. which is true about bitcoin. it is like saying torrent network will disappear but peer to peer connections will remain! you can't shut down torrent network since it consists of peers connecting to each other and sharing file. bitcoin is a much stronger implementation of a decentralized peer to peer network.

what will disappear is two things: 1. the altcoins without usage that keep being created even if they have the biggest market cap among altcoins 2. the government and bank issue tokens that are more centralized than anything else.