All this stealth and stuff means that our packages will no longer be forced to low level! Imagine spending all your airborne time being a medium level bomber! No more Death Star Valley or Mach Loop! Unthinkable! Still, the Welsh will be happy.
I'm guessing that it will be just a matter of time before stealth is compromised and low-level penetration again becomes important. These things seem to have a habit of going around in circles.