I think Ai should grow up and stay in the 'Shiho Miyano' form instead of 'Ai Haibara' one. Gosho already said that DC will have a happy ending, so I think she won't die.. In addition with this, I was thinking about the Subaru (Shuichi) & Shiho couple, it's my favorite one, but I think is not very possible. I think Ai won't like to live a lie, so she will revert to her real form and tell the Detective Boys the truth along with Kudo. But these are just theories.. I only hope that Ai/Shiho won't die in hands of the BO, that would be really sad for me though she's my favorite DC character along with Shuichi/Subaru.