If airlines have to pay more in insurance premiums or they have to pay millions of US dollars a pop for each dead passenger, they'll demand a safer plane.
To my knowledge neither of these conditions have occurred in response to the 737 Max technical issues. Corporations listen to customer complaints that are backed up by losing revenue - as was shown with the issue where a passenger was beaten up on a United flight, people are extremely price sensitive when it comes to flying - there is math that can make the 737 unprofitable, but I think it's unlikely that the math will turn in that direction, it would take an extremely negative PR issue to start this.
