In 2012, Jinichi Kawakami emerged as the last surviving ninja grandmaster. Kawakami believed that the art of ninjutsu has no place in the modern age, as we have better weapons, the internet, and better medicines. Masaaki Hatsumi, another surviving ninja grandmaster, has not appointed an heir. Once Kawakami and Hatsumi pass away, ninjas will forever cease to exist.
The article is quite incomplete when it comes to Masaaki Hatsumi - he started teaching westerners Budo Taijutsu in the seventies. Since then, it spread to all corners of the world. Also, it’s fair to say that ninjas in their original form no longer exist, but the art lives on and continues to affect its practitioners’ lives in many ways; see https://en.m.wikipedia.org/wiki/Modern_schools_of_ninjutsu