Some current researchers are arguing that Moore’s Law may be more limited than many have thought. The law states that the development of digital electronics is exponential. The original formulation was that the number of transistors that can be crammed onto a chip doubles every 18 months (originally it was every year, then every two years). A popular formulation is that the unit price of computing halves every 18 months.
The law, in whatever form, is important because it determines what we can expect to do over the next decades. For example, stealth never creates a signature-less airplane or missile or submarine. Instead, it reduces signatures by some large amount, leaving a much smaller signature to distinguish from the surrounding noise. Signal processing claws back a recognizable signature. How well it works depends on how well the surrounding random noise can be separated from the man-made signature of the target. How we evaluate the future of stealthy aircraft depends in large part on how we evaluate the future of radar-signal processing. The worse that future, the brighter the future of stealth—and conversely.