Swept wings are also unstable, requiring a yaw damper, and crashes have resulted from inoperative yaw dampers.
Of course, we could demand a return to straight wings, but then air travel would be a lot slower.
The low mounted wings on the 737 are serving a no longer needed niche. They were there to accommodate rolling air stairs, where you walk into the tarmac and walk up aircraft-internal steps to board the plane.
The last time I flew on a 757 (a couple months ago) I got on and off on the rolling air stairs.
Rolling is different, I shouldn't have used that term. The 737 can be deplaned with stairs that are integral to the aircraft.
Ryanair does still use the internal 737 stairs at some airports in Europe.