Entertaining, but realistically the UK will just get a "bad deal". Life will go on, political parties are blamed, then we get to repeat it all again because the next party to be elected does it on a platform of "renegotiating".
When you consider what a soft brexit is, it's genuinely nothing of what leave wanted. The UK still doesn't have a solid border between itself and the EU because of the Good Friday Agreement, the UK still had to pay the EU and follow it's regulations and for all that it gets zero say in the EU legislature.
So there is a real chance of a hard brexit and it's going to be very messy.
https://en.wikipedia.org/wiki/Jacob_Rees-Mogg
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Life will of course go on. The sun will still shine. But the idea that things will stay more or less the same in that case are mistaken.
I mainly think of layoff in company that highly rely on the trade agreement with the EU to sustain their business. An augmentation of unemployment combined with a possible devaluation of the money and an increasing inflation due to new importation taxes on basic needs items (food medicine, ...) could have some disastrous consequences on the lower and middle classes.
It could convince Scottland, which already struggle with poverty and voted against the Brexit (62%), to separate from the UK and try to join the EU (the last referendum was "only" 55% against leaving the UK). This might create even more trouble.
It is likely that a bad deal might yield enough difficult short term consequences to spiral out of control. A strong political leadership will be needed to handle them before they do. And currently, it is not unrealistic to say that no parties are ready to handle them.
a) Nothing changes, and in March 2019 the UK crashes out of the EU with no deal ("hard brexit").
b) Article 50 somehow gets revoked, and the UK remains in the EU, with a lot of distrust in the years to come.
Personally, I'm hoping for the latter but expecting the former.
No deal will mean life goes on with tariffs on many goods in either direction. As we have seen over the last two years the Foreign Office has seemingly lost everyone who has diplomatic ability. Funny, they used to be famously good at it. This is not promising for the chances of equitable trade agreements with anyone after Brexit. Life will go on but it appears it'll be a damn sight more expensive.
If the next govt wants to renegotiate re-entry to the EU the terms will be much less appealing than first time around.
And the UK is absolutely not set up to cope with customs checks on every vehicle crossing the Channel. See "operation stack".
Oh, and all our international air travel agreements are part of EU membership. Unless something is agreed planes will be grounded.
That would give the EU reason to block imports from the UK. It doesn't give much of a reason for the UK to block imports from the EU. So there's no reason to expect that the UK will starve or Amazon will shut down. The only way for that to happen is for the UK to shoot themselves in the foot (again).
Exports, of course, are a whole different story and that's where the risk lies. General economic damage from increased friction in exporting to the EU.
Given modern approaches to warehousing and logistics (see how quickly KFC completely fell apart when changing chicken supplier recently) there will be shortages and probably issues with fresh produce. If there are some shortages, any shortages, panic buying and last minute stockpiling will commence. Then there will soon be real shortages.
(Are EU truck licenses valid in the UK after Brexit? And vice versa? Who knows?)