Like many questions in this area I’ve read various answers. From its now legally locked in to we could stop the process at any time.
I think it’s pretty clear the EU would not be ‘difficult’ if we said we’d only been kidding. We would not get back things like the Medicines agency. Would not put it past them to try to impose worse terms (eg no UK rebate) if we stopped art 50. They are that stupid.
Oh and JRM is a twat, by the way. Just because he agrees with you on brexit does not change that in any way.