Economics is extraordinarily bad at predicting the future, which is why many people question its claim to be a science. There is a lot of impressive mathematics in ecobomics but it is all dependent on the inputs, which are very random.
There are many measures warning of a potential collapse (volatility creeping up after a period of very low levels, long bull market etc). However people making bets on future collapses have generally lost all their money before the collapse happens.
It is hard for me to see Brexit triggering a collapse. Ultimately global interests are aligned to banging the uk and EC commission’s head together until they come to some kind of face saving deal.
I’m addition it is always easy to see scary factors but harder to see positive ones. Global corporate profits are strong, commodity prices are stable and, despite some regional instability, we are in a time of peace. New energy sources are being developed and becoming cheaper and technology, which should improve productivity, is advancing space.
Personally I am cautiously bullish. I am remaining invested (in a globally and sectorially diversified way). I think we see substantial new highs before the inevitable correction.
However anything could happen...