Selective Availability is on its way out. In addition to being disabled for 20 years, supposedly the new 3rd generation GPS satellites were built without the capability.
JDAMs apparently have had an inertial system for backup for some time. MEMS gyros are good enough to guide from release to target. DARPA has quietly been working on compact, low-cost guidance without GPS for a while.[1] Doesn't seem to have filtered down to the commercial market yet, and that's probably not an accident.
