Comment by fasterik

You're thinking in terms of the traditional peer review model. I'm imagining a more organic process where papers are scrutinized to the extent that they're considered important or promising. For example, how Grigori Perelman's papers on arXiv about the Poincaré conjecture were reviewed by peers. There's no assignment of individual reviewers in this model, it's a natural byproduct of researchers discussing and collaborating in public.