MMW: Battlefield 1 will prove to be a major success, prompting a wave of World War I-themed media

And why not? We were in the middle of WWI 100 years ago as I type this. Plus: hipsters. Since WWII is the one everyone knows, WWI has hipster cred.

Finally: grey-on-grey. Unlike WWII, where we clearly knew who were the bad guys, WWI is a much more nuanced and unclear situation. These things come in waves— sometimes straightforward Good vs. Evil is popular, and sometimes Grey vs. Grey morality is popular.

Bonus: Steampunk. Who doesn't think Steampunk and WWI don't go together like chocolate and peanut butter?