The system they have now is the #! hack, the crawlers know how to request static versions of the pages. There isn't a similar mechanism for pushState based desi

The system they have now is the #! hack, the crawlers know how to request static versions of the pages. There isn't a similar mechanism for pushState based designs, you just serve up the content pre-rendered for the initial page. So that's probably what they will do to stay indexable. It will also make the first page load snappier (probably)