いいんだけど

it would be nice, but...

→ 良い
phrase Uncommon #9,381
it would be nice, but... Often expresses a wish or reservation. Depending on context, it can mean “it’s okay, but...” or “I hope so, though,” and んだけど softens or leaves the rest implied.
JA: 行けるといいんだけど。
EN: I hope I can go.

トムまた余計なこと言わなければいいんだけど

I just hope Tom doesn't say something he shouldn't again.

寝る時間がたっぷりあればいいんだけど

If only I had plenty of time to sleep.

それはいいんだけどやっぱり彼女をここに置いてはいけないよ

That’s fine, but we really can’t leave her here.

— バジュランギおじさんと、小さな迷子 (2015)

ついでに今夜泊まるを連れて来てくれるといいんだけど

I wish you’d bring along a house for me to stay in tonight while you’re at it.

— ハウルの動く城 (2004)

バーベキューするのはいいんだけど煙が目にしみるのが嫌なんだ

I don't mind barbecuing, but I hate it when the smoke gets in my eyes.

いいんだけど

I don't mind, but…

— サイコ (1960)

それでもいいんだけどこういうのはどうかしら

That works too, but what do you think of something like this?

本当だったらいいんだけど

I wish it were true.