Conte might have his reasons for rejecting the offer and they will have to respect his decision.
I think Conte wait for the offer from Juventus. There was a rumor that Juventus will fire Allegri and replace him with Conte. It makes sense if Conte prefers to join Juventus because he ever succeed with Juventus. He should have a bit intention to succeed again with Juventus in the next season.
Conte's return to Juventus is certainly a possibility remembering his successful record with the club and the ongoing rumors surrounding Allegri's future. His bond with Juventus is quite strogn, because he was also a captain for Juventus.
Conte's demanding yet effective coaching style, coupled with his deep understanding of the club's culture and traditions, could make him an ideal candidate to bring back Juventus's dominance in Serie A. Juventus fans also love this idea to happen, because they want their club's identity to be back to their club which feels it has lost for some years.