Will future wars be fought like Enders Game?

 It might be.   With increasing use of unmanned sea, land, and air vehicles,  with increasing use of autonomous robots and drones, this could be very well the trend.  No need for large armies, huge arsenal of deadly weapons.  Only kids who are well versed in games - video games.  They can determine the outcome of human civilization

It might be less taxing on resources, less mortality -  thereofore politically and economically palatable.

Let it be.