Wiki says that 7,031 B737 NGs have been delivered.
Only those NGs that have exceeded 30,000 cycles need to be checked within 7 days, (or 22,600 cycles within + 1000 cycles).
FAA estimate that only 1911 (US aircraft) are affected of the 7,031 that have been delivered so far (presumably because most haven't yet reached 30,000 cycles).
This will be an ongoing problem for many years to come as each and every one of the 7,031 delivered air frames reaches the AD cycle inspection requirements.
Say 5% of inspected aircraft fail the AD at 30,000+ cycles, what percentage of the remainder will subsequently fail the AD Inspection at say 40,000, 50,000, 60,000 cycles etc?