If you look back at the 2000 .com bubble burst then you might notice that the dow towards the end was less volatile and smoothly went towards the cliff this happened realtivly quickly. The dow by 2008 had yo yoed havily until it peaked of the cliff this time it peaked slower and fall of the cliff faster. The since has been going up similar to the 2000 crash by might just be about to heavily yo yo.
2000 not much war and not much competition to Europe and Americas rule. skip to 2008 and China was risng fast. Skip to now and china is sitting pretty economically at least and with trumps politics that could lead to economic issues but may be less military issues as both seek to resolve war issues more.
However the old guard still hold a few cards in the market and it could yo yo to the peak.
So far we look to last a bit longer than the cycle from 2000-2008 it's more like 90's-2000 though in the shape so we might have less trouble at the next crash point.