It’s apparently reaching critical levels.
According to Independent, “There has been an increasing demand to see the iconic warriors perform ‘ninja shows’ to crowds – but martial arts squads are struggling to find candidates who are up to scratch.”.
Takatsugu Aoki, the manager of a martial arts squad Nayoga, Japan, told theAsahi newspaper, “With the number of foreign tourists visiting Japan on the increase, the value of ninja as tourism content has increased. There are more employment choices, while ninja shows across the country have become popular. I feel there is a ninja shortage.”