the fact that you get to ride a hoverboard doesn't make a good game. the back to the future movies were funny and kinda cool back in the day, with good effects and a kind of lighthearted view of time travel. this doesn't mean they would make a good video game.

they tried it already, and as i remember, the game was made as back to the future 1&2, they didn't have enough content to make a game out of just one of the movies