What future for Marty without his trip to the 50s?
His family at the beginning is full of losers and slackers.
He fixes their fortunes by going to the past.
Yet, his own future family is quite unsuccessful (so much so that Doc finds it necessary to fix it again).
What would their future be if he still belonged to his original family?
Would it still need Doc to fix it?
Or would Marty, who seemed already clever and resourceful at the beginning of the film, turn out successful and accomplished had his parents NOT spoiled him with their own success?