Among both modern militaries, big business, and tweens, the latest thing to have is connectivity. A connected battlefield means lots of complex systems talking to each other, and lots of soliders who need to know how those complex systems work. It makes sense to teach people these systems on desktop sims first, as it imparts a basic understanding of the e-warfare environment before training on more complex (and expensive) simulators and live exercises. I think that's the angle DCS is best prepared to approach this market from, anyway.