We've seen it take a year for quarterbacks to settle in and thrive in this offense (e.g. Matt Ryan started in it in 2015 and then excelled in 2016, Jimmy Garoppolo has been in it since 2017 but just really came on strong with consistency in the 2nd half of this season, the Titans' passing offense didn't just immediately blossom when Petals arrived).
If it's next year and Rodgers still can't find consistency, then I think you start thinking about drafting someone with intention. But it's both way too early in this offense and way too early in this contract to try and find an heir apparent in 2020.
2015 Matt Ryan:
66.3% completions
21 TDs
16 INTs
7.5 yards/attempt
89 passer rating (6 games with 100+)
64.1 QBR
2016 Matt Ryan
69.8% completions
38 TDs
7 INTs
9.3 yards/attempt
117.1 passer rating (12 games with 100+)
79.6 QBR
MVP of the league
Should have won the Super Bowl
Difference between he and Rodgers is that Rodgers with the 9th best scoring defense in the NFL has the Packers at 13-3 and Matt Ryan with the 14th best scoring defense finished 8-8 in their first seasons in the new system.
Matt Ryan led his team to the 21st best scoring offense, and Rodgers has led his team to the 15th best scoring offense.
As far as weapons are concerned, there are some differences, but not insanely different. It could be argued that Ryan was "force feeding" Julio with 136 catches for 1,871 yards. Same kind of "narrative" with the Packers. Davante's numbers extrapolated over a 16 game season would be 110 catches for 1329 yards (which likely would be even better, given how light we eased him back after the 4 game absence). Julio that season is obviously superior to anything Davante has accomplished in his career. So far.
Both quarterbacks' #2 player in terms of number of receptions for the season? Running backs (Jones for the Packers, Freeman for the Falcons)
Before you get to another receiver in either situation, you come across a borderline tight end in terms of receptions. (Graham for the Packers, Tamme for the Falcons...both in their twilight years in the NFL).
Then you get to average to below average wide receiver options as the #2's (White at the backend of his career, Lazard an unproven, undrafted FA)
To your point, year 2 has the potential to yield some very nice results for Rodgers, especially if they're able to get him another weapon or two, similar to what the Falcons did in signing Sanu the following offseason.
Again though, to really drive this point home...
Anyone expecting for Rodgers to be 100% comfortable and 100% of his full capability in this new offense in year 1, with very limited personnel around him, was absolutely fooling themselves. A little bit of patience will need to be exercised.
That Rodgers even has his team in position to win 2 games to get to the Super Bowl this season is somewhat remarkable, in my humble estimation.