I'm really excited for preseason football this year because we get to see Brett Hundley play. I was a fan while he played at UCLA and I'm excited to see how much he's grown by studying under Mike McCarthy.
Regarding the topic of his future in Green Bay...
If the Packers could convince Hundley to re-sign when his contract expires, then he'd have a legit chance of succeeding Rodgers. Steve Young didn't officially succeed Joe Montana until he was in his 30s.
The odds of that happening are slim, as there was no free agency back then. Still, consider this; Rodgers' current contract expires in 2020. Hundley's expires in 2019. If the Pack just let Rodgers go or franchise and trade him in 2020, then Hundley would be assuming the mantle at 27. That's still very young.
Of course, this would only happen if Rodgers begins to show regression in his game and Hundley shows significant progression. There is a path, however. It's a long one, but a good front office could make it happen if they want.