User blog comment:Xilinoc/Ch. 545 - Blue Stripes/@comment-4822693-20130709222211/@comment-2211792-20130710142059

Aizen's presence was lethal because the Hogyoku made him a transcedent being, something beyond Soul Reapers and Hollows. And Ichigo is still a human, despite his wide set of powers. I doubt poeple will die from just being around him, especially if he learns to suppress his reiatsu. (Or he can just get a power limiter, or Urahara can give him another power-suppressing gigai.)