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That is actually an interesting question though. Has it been decided yet on the EU side whether Article 50 can be revoked?
Overall, I think the EU would much prefer the UK to stay, especially if that is the result of a UK movement rather than something that is seen as being imposed on the UK. While the whole "they need us more than we need them" is of course bullshit, the UK leaving the EU is still not good for business in a number of EU countries - it's not like they're actively trying to get rid of the UK.
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I think we mostly agree around here that the whole "the EU are just doing x to punish the UK" line is BS, but the one truth I can see in it is a desire to make the decision permanent/irrevocable - because that will make it far less appealing to other countries wanting to go down the path in future. (and could have the added benefit of forcing any potential country to have an internal dialogue first so that the terms of Brexit means Brexit are actually worked out before the Article 50 button is pressed.
Also ^ is a good point @aggi when you stop and think about it, for all the cake-ism that has been thrown around, the EU have almost let a cake situation happen- in our current status is about 90% cake which has been taken for granted
This still assumes that Parliament can somehow revoke Article 50 and say actually we don't want to leave. Pessimistically I would imagine the EU will say That's it times up and out we go, regardless of if we want to or not