No magic crystal balls will answer this question.
The only person who knows is Jr himself, he's accomplished a lot over his career and is ready to call it a career. He's had so much pressure throughout his career from the drop of the first green flag and he's ready to just step away, I don't blame him at all. I'm actually quite happy for him, he wants to be with his wife and live a "normal" life.
I am very happy for him also. I'm glad he found someone to share his life with before he retired too.