This is the 14763rd most frequent Korean word.
바뀌었으면
"바뀌었으면" means "if (it has) changed" in English.
The word '바뀌었으면' in this sentence expresses a wish or a hope for the change in the state of the weather.
날씨가 바뀌었으면 좋겠습니다.
I hope the weather changes.
Here, '바뀌었으면' is used in a hypothetical context, imagining the change of the rule and its potential consequences.
그 규칙이 바뀌었으면 더 편리했을 거예요.
If that rule were changed, it would have been more convenient.
In this sentence, '바뀌었으면' is used in a past conditional context, discussing how a change would have affected the possibility of attendance.