onto more practical stuff and away from political debate this link shows some of the political and legal machinations required to even invoke Article 50
https://ukconstitutionallaw.org/2016...pensable-role/
It's a bit of a heavy read but if this is your thing have a cup of tea and give yourself 20 minutes.
To summarise
"A quick pull of the Article 50 trigger is unlikely to be feasible under the UK’s constitutional arrangements and may well not be desirable for any UK Government or Parliament, even one committed to eventual withdrawal from the EU."