On one hand this will make it harder fantasy writers to write the stories that they want to. On the other it may force us to be more creative and could result in a whole new batch of tropes for the future. I really don't think there is such a thing as a new idea. Everything has been done for. It just hasn't been in precisely this way or that way.
Every writer interprets ideas and story material in different ways.
That's what makes them seem so original. Opinions differ on Lemony Snicket. Even ignoring the spam marketing, the books are at best indifferent and lack any verisimilitude, as they seem to take place in some kind of emotional vacuum. The only outside influences seem to be those that advance the main plotline. There are new ideas all the time, Frederick.