If the wingtip took an impact force, think of the moment arm and the effect on the wing root...
I don't have to imagine that. I have seen the damage that was done to the spar and spar box of a PA28 after a more or less similar taxi incident. The wingtip was dented but that was the easy fix. Fixing the spar box was a major structural repair job that lasted three months or so.
But that taxi incident was duly reported and the aircraft immediately grounded.
Wings are designed to take load mostly in the vertical. In the horizontal plane they're relatively weak. In fact, glider wings have a special diagonal spar in them to handle the horizontal loads that result from a winch launch.