OK, we can still run some user script or have a browser setting, which removes the ?757569643D2E2E267265733D31393230266F733D4D61634F53266F part for things like images. What would be the level after that?
ie, se09d.png
Also used sometimes for standard cache invalidation efforts so common for both nontracking purposes too.
Worst case sites will just install a middleware layer to proxy all their requests and traffic back to ad tech machine I'd imagine or install some middleware on their stack.
Think along these lines: website.com/blog/f5/babBys-first-bl0g-post-2f.html
Can you (or a computer program) answer definitively whether there's a tracking ID in that URL?