Not only expect to see a "big crash", but expect to see total collapse of Capitalism with French style Revolution within 5 years. There will be blood in the streets literally not methaphorically as it should be.
We know people need to eat or else they die painfully. We also know you can buy food with money. We also know job gives money for majority of populus. We also know jobs are being eliminated completely within 5 years and then physical jobs also with robots.
So knowing this, if people have no job, no salary, no money to buy food with, they will get their food by force. It's just a logical conclusion.
And no, nobody will give you UBI, stop being naive. UBI has been depunked by economists numerous times, it just doesn't wokr mathmetically. World will transition to communism and the upper class will be simply eliminated physically as it has happened in the past.
Define "pretty" picture. Everything free for everyone aka communism sounds amazing and tell me how it's better than what we have now with people starving and child amputees having to beg for pagpag in dumps of Manila.