Forces required to remove a winglet are not that much I have a pic of a BBJ winglet left in the horizontal stab of another aircraft on taxi.
The leading edge cuts in like a knife through butter but once it hits something hard (Spar etc) then the composites come apart pretty easily.
Given the closure speed head to head would be 1600km + then a winglet will go through the front a 737 with no problem, if it went right in the front it would go through the cockpit floor and subsequent control cables before it hit the nose gear support structure and entered the e&e bay. Game over after that.
I had a look at my NG FCTM for non normals and basically is say your on your own.
All conjecture at this stage anyway those 3 view pics could certainly be different if the 737 had even just a little bank on it….., some one hit something over Brazil and a lot o people have lost their lives, the final report will certainly make for interesting reading.