He's suicidal anyway. He takes the wrap and either kills himself, or let's the club do so. Everybody's happy. Jax gets the killer of his wife, Gemma gets off again (probably temporarily), and Juice checks out while helping Gemma and the club.
Jax will eventually find out about her killing his dad and wife. I think he ends up killing her at some point.
Shortened version is that Jax will have the opportunity to kill Juice, but doesn't, ultimately leading to his death. The series will end with Juice and Wendy together, with Juice raising Jax's kids and restarting the cycle. Jax/JT, Juice/Clay, Wendy/Gemma, and Thomas and/or Abel/young Jax. Brings everything full circle.