Maybe not. Though turning to the Dark Side certainly wouldn't have helped him or anyone. But if it would have saved him, Obi-Wan would certainly have given his life for him.

But the Jedi's smile broadened as he saw Ezra's face light up. "Yes, we can, and we will be. You won't be rid of me that easily." This said as he put his arm around Ezra and pulled him into a half hug. "Families come in all sorts of forms, as you well know."