The future is a foreign country. They do things differently there.
Who says time travel is impossible? On October 21, 2015, All of us, along with Marty McFly, are scheduled to arrive from 1985. Marty will be surprised, when he gets here, to see that the future has changed once again as the result of his constant meddling. In our future, the Chicago Cubs will not win the pennant. We have hover boards but they only work on magnetic levitation technology.
Somehow Biff has morphed into Donald Trump and lost some hair..
Business Interests claim that Mexicans are just taking the jobs that lazy American slackers don't really want.
Jaws 19 never got made, but video conferencing and handheld tablets are here. On the other hand, Pontiac dealers and the future "Queen Diana" had their futures both sadly changed somewhere on this new timeline....cold fusion didn't make either...what else has gone wrong because of Marty's interference?