Is hbk Shawn Michaels out of wwe 4ever or there is opportunity to back to wwe again like Bret hart?

Shawn Michaels has decided to retire from in ring Wrestling. However, there is some speculation that he could return in a few months on a limited basis as Ric Flair did post WrestleMania 24. Also there has been rumors of him joining TNA if he decides to come back to the ring. Having said that, it is very unlikely to see Shawn in the ring again except for a promo with WWE. ( i.e. WWE Hall of Fame, Guest host, Special Referee, etc. ) Shawn has been considering a reality show about his life post WWE, and it would be similar to Hogan's Show. Knowing Shawn's history with retirement and his passion for WWE, a return is not out of the question, but is extraordinarily unlikely.