They are announcing so many shooters because its easy.
Why? Well the basic ground to create shooters nowadays are so easy considering that it's been pretty much perfected. Secondly there doesn't need to be a lot of thought in really anything but the online and visual sections to capture hype. Gameplay is easy enough because of reason 1 and story and setting are so limited in choice nowadays that any pick is good. Finally the market is so wanting of this genre that almost anyone will sell pretty well, especially if it obtains that hype.
In a couple of years however, it's this kinda thing, that will actually make it too risky to put out a product like that. Why? Over saturation of the market.








