How is this a disaster for Brexiteers? Aren't they all gentry and aristocrats who want to return to a stratified, and therefore poorer, economic regime?

I may sound sarcastic here, but I assure you, I'm asking a serious question, and I welcome corrections on both views of Brexiteers and disasters.

The campaign group Led By Donkeys (exactly what it means) has produced a video Brexit: an update

https://www.youtube.com/watch?v=IUiJxH2pclM