Sure, Kakashi is present in the Boruto manga. His role might not be as prominent as in the Naruto series, but he still has significant moments and interactions.
Kakashi is very much alive in the Boruto manga. The manga doesn't include his death. Maybe you got some misinformation or confused it with another character's fate. But for sure, Kakashi is around.
Some fanfictions might explore the idea of Naruto being betrayed by someone close to him. This betrayal could lead to a situation where he is caught off - guard and killed. It adds a dark and dramatic twist to the story.
The other ninja villages would also be affected. Naruto was a key figure in maintaining peace and balance among the villages. His death could lead to old rivalries resurfacing. Without Boruto, the future that everyone had envisioned for a more united ninja world would be in jeopardy. Some villages might even see this as an opportunity to expand their territories or influence.
Perhaps he has discovered a great threat that is specifically targeting him. To keep the village and his family from being collateral damage, he fakes his death. This way, he can secretly gather information, train more, and come back stronger to face the threat when the time is right.
One possible plotline could be a powerful new enemy emerging that neither Naruto nor Boruto can defeat alone. Maybe an ancient evil that has been awakened and has powers far beyond what the ninja world has ever faced. Their deaths could be a sacrifice to seal this evil away, protecting the village and the world at large.
No, Boruto is alive in the manga. The plot hasn't led to his death. However, the manga is ongoing, and anything could happen in the later developments.