Since the UK entered eURO
I believe the exit of Great Britain will cause other countries to re-think their part in the union. As for Spain they were better off when they ran their own economy. Members of the EU are not on equal footing and a lot of countries are far richer than others and have had to subsidize those who are poorer. Since British holiday makers made up a lot of the tourists for Spain they would be killing it for themselves. The number of British traveling there has started to drop. Britain have lived independently for centuries. They can do it again and do not need the EU otherwise how would other countries survive who are not part of the EU. The British have found it just as cheap or expensive whichever be the case to travel to other places now. It basically is what Hitler wanted only done without war and with Germany holding the reigns. he poorest in Britain are being put into absolute poverty whilst the fat cat Europe is getting richer on their money. If more countries exit at this time then where will that leave them? The Queen of England sees no purpose or reason for the country to be in the union. It does England no good just costs money. The EU leaders are worried about other countries exiting and trying to make things difficult in the hope it deters others leaving. If the other countries were wise they would leave too.There would be no EU to leave then, it will be disbanded and everyone gets their own money and runs their own country.
On the contrary, the EU is making it as easy as possible. They have offered Britain a number of models for how the relationship can work in future. What they cannot do is undermine the system of treaties that makes the EU work. The reason for the lack of progress in negotiation is that the UK side stupidly thought - and largely continues to think - that the EU sees a deal in terms of
trade and that they could therefore use the prize of access to the UK market to get the benefits of trade without the costs and constraints that go with the EU system. In effect, the UK thought it could drive a coach and horses through the EU treaty system, thereby wrecking it. The EU has said from day one they would never agree to this, hence all the stuff abut cherry-picking (and Bozo's idiotic and inflammatory remark about having cake and eating it). Interestingly the head of a major German trade organisation has commented that for German industry the prize presented by the EU Single Market is worth far more to them than access to the British market for their products. So German industry is right behind the EU stance.
If the UK leaves with no deal, the automotive and aerospace industries, and hundreds of thousands of highly paid jobs, will be at serious risk, because these businesses will be uncompetitive, due to border delays on stocks of parts ruining their just-in-time business model. Salaries will go down. Unemployment will go up. And people will search for someone to blame.
Apart from that, it will all be great.
And, no doubt, other EU members will be queuing up to repeat the experience. Or not.