Next - select your own cast for the movie you're about to watch.
LAFORGE: Computer, in the Holmesian style, create a mystery to confound Data with an opponent who has the ability to defeat him.
COMPUTER: Define parameters of programme.
PULASKI: What does that mean?
LAFORGE: Computer wants to know how far to take the game.
PULASKI: You mean it's giving you a chance to limit your risk.
LAFORGE: No, the parameters will be whatever is necessary in order to accomplish the directive. Create an adversary capable of defeating Data.
We're steadily approaching science fiction when it comes to creating things like this.In Rogue One, ILM already conjured the younger forms of two actors using CG and achieved damn near photorealism in doing so. Furthermore Disney's TRON: Legacy (2010) featured a slightly uncanny but nonetheless impressive young Jeff Bridges.
A fully photorealistic and believable young Harrison Ford in about ten to fifteen years doesn't strike me as entirely beyond the pale.