It's four BB seasons. A long time, but it's still 25% of the time in which BBs may already implement change.
A year is an arbitrary time period, I admit, but even if it's two or three seasons, the sentiment remains the same.
I don't know that a blanket moratorium is the right answer either. I think that if there's a real problem, a change is needed, and if there is not, no change is needed. For example, all this 2-3 talk, they looked over it and said essentially that it's working as it's intended to and that people aren't using the right type of players to make it be the effective defense it could be. That seems perfectly reasonable. If, on the other hand, they had seen that, for example, they had failed to balance it properly (e.g., not counting the guards' OD skill when considering the opponent driving, making offense way too successful), then they should definitely make a change.
Essentially, and I mean this in as positive manner as possible, not only should they not make changes because people are complaining, but they should also not refrain from making changes because people are complaining about change.