6th biggest economy in the world thanks to great trade advantages. The trade deals we have contain rules. Apparently we don't want to abide by those rules... So we will rip up every trade advantage we have and start again - although we will still be bound by the rules of the WTO - the rules many who want Brexit actually want to be rid of... the same rules that also restrict our trading alliance, the EU.
The people who make this country the 6th largest economy (not the billionaires who want to avoid taxation) are opposing Brexit. Hence the fears of Airbus, Nissan, BMW, and all the small British suppliers of engineering components. And then let's not start to think about our service industry. Apparently, overnight they will displace companies based in Switzerland and Singapore in their markets.
Yes, some countries like the idea of the UK out of the EU. Chile and Korea for example, because they think that they can achieve a better deal from us... They think they can gain a trading advantage over us.