Nobody is stopping people from using the relatively new article or header tags. There is not really an inherent advantage in using divs except that they are barebones maybe. Apart from that, there are data attributes which are actually used on real-world websites for annotation of texts. Indeed they go particularly well with span tags.

People forget that all these fancy frameworks produce actual HTML5 DOMs, who cares if those are static or dynamic. I someone wants to write a semantic web parser/crawler then it's a great idea, but probably it shouldn't be done using wget. :-)