I think this is fine and where us crypto enthusiasts go wrong - most folk neither know nor care how the internet works (myself included!) and the same is true with the blockchain. I wouldn't even mention blockchain.

Maybe explain as the "next version of the internet" or a "new internet that will get rid of middlemen". This might enthuse and/or fill some with terror for the future of their livelihoods (myself included, again!!! lol)