Pure technical a market crash is very plausible, adding to that the bad economic news, the zoomed out consolidation market (which is a turning sign).
Any major event this year (like for exemple us elections) could trigger the steep decline.
But looking at the narrowing Patern it could even start in Juni whit a rate hike/brexit.
This week the ECB launched there concerns for a market crash based on similar paterns combined whit FA news.
L1 and L2 channel lows have similar paterns to 99 and 07 market (right before the crash)