That is not a 1980 grille....in 1980, there was no Blue Oval in the center and instead, FORD was in chrome letters across the front of the hood. But, in fairness...I get your point.
Every design evolves....even today's Wrangler that looks quite similar to previous iterations, but they are very different. I am saying that Bronco will evolve, I just believe that it will take on Ranger styling cues as they both evolve.