All signs are pointing that Star Wars Land is replacing Streets of America, and if it happens the lights will be gone. They could always move them to Disney Springs.
It'll be a huge, huge loss. They need to find a way to salvage them. It's one of the best things in the whole resort. Trouble is, it'd still have to be somewhere in DHS. Maybe MacGyver it around Sunset or something? Mock it up on the old Hunchback theater?
Putting it on Sunset wouldn't work with the Fantasmic crowds.
Would it be easy, no? Could you make guests exit down Highland and backstage to the park entrance? Theoretically.