>I'd definitely book tickets that I can change at the last minute, and refuse to board if it turns out to be a 737 Max.

E̶v̶e̶n̶ ̶w̶i̶t̶h̶ ̶f̶l̶e̶x̶i̶b̶l̶e̶ ̶t̶i̶c̶k̶e̶t̶s̶,̶ ̶m̶o̶s̶t̶ ̶c̶a̶r̶r̶i̶e̶r̶s̶ ̶d̶o̶n̶'̶t̶ ̶a̶l̶l̶o̶w̶ ̶y̶o̶u̶ ̶t̶o̶ ̶c̶a̶n̶c̶e̶l̶ ̶l̶e̶s̶s̶ ̶t̶h̶a̶n̶ ̶2̶4̶ ̶h̶o̶u̶r̶s̶ ̶p̶r̶i̶o̶r̶ ̶t̶o̶ ̶d̶e̶p̶a̶r̶t̶u̶r̶e̶ Also, airlines would most likely charge you the difference between the fare price, which for a last minute ticket is might be a significant price difference.

>But I rather have to wait some hours for the next flight than take the risk to die because of Boeing.

So you'd rather lose a few hours of your life waiting at an airport, than losing a few minutes of your life over the risk of dying from a 737 Max? Whatever floats your boat, I guess.