I don't think any of the genins are going to die. The reason I believe this is because thematically Naruto is not a dark manga. It's a lighthearted coming of age story centering on a ninja boy and his fellow classmates. Think about it, how many well-developed "good" characters have died? The 3rd Hokage. How many well developed villians? Haku and Zabuza. The only reason the aforementioned characters died is because their narrative purposes were fufilled. This whole one-on-one fight sequence fits the "anime battle format" perfectly. Each of our heroes are getting seperated, they fight a losing battle, but eventually win by the skin of their teeth. They are made to look like they are going to die, but the audience later gets some scene showing our heroes being healed moments before they bite the big one.