I actually think the opposite because of what his problems are. You are trying to change how he has played football for years so you want as much time to make them natural away from actual QB play as you can.
I can promise, even if his form looks great in practice, that once hits start coming the form will go back to his default which is why I wish for more time to make proper form his true default.
Again this is not me knocking him, mechanic changes are hard, and when I see himbI really see a Rodhers level ceiling BUT its really hard to change what you have been doing your entire life.
but they're not changing how he's played football, all they are doing is adjusting his mechanics and footwork which he's now had months of practice with live reps to get more comfortable with
as big as the change is, the mechanical adjustment is not that major - it's a wider base, and some footwork changes mostly - it doesnt look like his release has been changed at all (which would be the adjustment that would take the longest or be most susceptible to going bad)
i just really dont see them being real problems