I haven't seen adjudications of O-1 petitions becoming more difficult but my experience, like everyone's experience, is anecdotal. The regulations are unclear/inconsistent on whether a singular instance of a criterion (media, publications, awards, etc.) is enough to meet that criterion but in my experience, yes (although multiple instances is always better). Once someone has obtained one O-1 visa, it's generally very easy to get the next O-1 (and much cheaper, easier, and faster than getting the first one). That applies whether the first O-1 was a company O-1 or an agent O-1.