Difficult question. If not a fan of either team and looking at straight up talent vs potential, you try and make that trade but once team situations and cap come into play, you don't and cross your fingers on Fields. Rodgers will likely still play ay a high level for the length of Fields rookie deal. There's no guarantees Justin excels or decides to stay ifhe does and that would lean you towards Aaron.
The reason you don't is that, in a best case scenario, the team doesn't compete for a SB for a few years with Rodgers because it's not setup to pay him without stripping talent at other positions. The window for a SB would be a couple years, 3 years down the road and only if everything goes right. That's with a trade that doesn't strip us of picks which wouldn't happen. Player for player, you do it because bird in the hand but team for team, you don't.
The answer becomes no with the Bears current situation but Denver didn't take Fields, would have given the Pack their #9 pick the instant they asked for it and the world would have called it stealing.