Isn’t your idea just as much unicorns and rainbows as much as leavers are oft accused of. Which party are going to introduce these sweeping electoral reforms?
Well... it's not in the interests of either the Conservatives or Labour, but it benefits everyone else.
The Lib Dems, Green Party, SNP, Plaid Cymru and UKIP made a cross-party petition for electoral reform in 2015. It's been a Lib Dem manifesto commitment for a long time (although they favour the ATV system) and the Greens have had proposals for changing the structure of democracy for a while as well. So it is only the two larger parties that are blocking it (assuming Farage imposes similar policies to UKIP to such issues onto his new party).
I remember the ER referendum from 2011, it failed by a large margin - but it was biased by offering an AV solution that was the least desirable to many in favour of the principle of ER. Like Brexit, a single referendum could never cover the whole issue. Have one to approve the idea in principal, appoint a commission to identify alternative options and publish factual information about their likely outcomes, have the final selection confirmed by a second public vote.
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It's an achievable idea, and the timing is currently very good. Government is about to decamp out of the Palace of Westminster to allow for extensive repairs. Instead rebuilding what's there now and having two sides face-off against each other shouting and booing, we could change the layout to something more conducive to listening and agreeing consensus.