Like their older cousins the Killer App, they can change the computing landscape in ways that we no longer recognise the old world. Think spreadsheets, internet browsers, email. All of these meant live as we know it changed.
The killer app or Dapp these days is a holy grail of developers.
Imaging a Dapp that meant you could trade most of the current financial markets, without a broker and all anon.
A lofty target, but it looks like it could be on the horizon.
https://sludgefeed.com/how-maker-plans-to-create-first-killer-dapp/