I would say there has always been demand for war footage. The difference is now the actual footage is not filtered by governments, propaganda firms, and typical news media sensibilities. The internet is mostly everywhere, and seemingly everyone has some kind of device capable of filming high definition footage. Even if it's not encouraged, it's still going to be very, very difficult to stop unless you turn off parts of the global internet to your (nations) users.

Add to this that war is becoming heavily drone based, via both in purpose built weapons and improvised devices that have recording capability built in. War is not something that is far away, but something that is right now on the device you're carrying.