If I'm reading and viewing all this right, the likely failure would be a wing skin panel tearing free from the ribs at the attachment point (the little dog-biscuit-shaped "feet"). Correct?
Which wouldn't be good (lot of noise, lot of drag, loss of a percentage of lift, possible jamming of loose panel in flight controls) - but is a lot different from the ribs or spars themselves departing the airframe (the wing "falling off").