How long will lebron james be a miami heat member? ?

He's signed to a 6 year contract but he can opt out an leave after the fourth season and he joked around after a nets game an said ill be a free agent in 4years start recruiten me an than he laughed ... I personally think lebron is the type of man that likes to explore and the way the miami heat are playing aint perfect i know its the beggining but seems to me everyone thinks it aintgon work out forever because you have lebron an wade who are the real superstars an they have to share unlike the celtics big 3 what ppl dnt realize ia the celtics have a big three but there big three have a talent there good at ray allen a great 3pointer kevin garnett great in the post an paul pierce a great shooter an he can go inside so they put those talents together there great but lebron an wade those are elite players with more than just 2 or 3 talents so i think the chemistry aint gon be on point always and i think one day there gon want there stats to go up so i dont think theyll be on that team forever so my question is "do you think lebron will be a heat forever or he will leave after his 4th season"???