The NBA wants to be back in December. The NHL is aiming at games resuming in January. Baseball’s spring training may begin in February, like normal.
They almost certainly won’t be in bubbles if and when any or all of that happens.
But many of the lessons learned from being in some form of a bubble environment — where the NBA, NHL and Major League Baseball each crowned a champion after finding a way to finish their seasons in most unusual circumstances — could apply to whatever the new definition of normal is for those and other sports.