Yes Adora - although the precise timing of a crash is uncertain, the warning signs are generally there.
Interestingly, in addition to Brexit, at the moment we have (in no particular order):
Italy in recession (two quarters of negative growth);
Germany recording a quarter of negative growth (and their car industry is in trouble due to excessive reliance on diesel, the emissions scandal, etc. - also parts of their banking industry, particularly Deutsche bank, are in trouble);
The Gilets Jaune in France and the underlying causes (fuel taxes and the economic problems which led Macron to impose them in the first place - and those underlying problems aren't going to go away just because the GJ have got their own way on the taxes);
Trump starting trade wars left right and centre;
China not looking nearly as strong as it did (plus a lurch away from the "centrally controlled capitalism lite" of recent years and back towards a more Maoist type economics);
Impacts of climate change - sub Saharan Africa and Australia in particular are struggling (the impact of this southern-hemisphere summer on Australian agriculture has been absolutely devastating);
And a walk down your average British high street counting the number of vacant shops (plus the numbers of big chains which have gone under, and the fact that not even the online sector is imune - ASOS have announced big reductions in profits in the last quarter).
We are headed for a global recession in the next 6 to 18 months, I think. I also think it's going to be a spectacularly bad one - in fact global depression, late 20s/early 30s style might be a more accurate prediction.