回不来

can't come back

→ 回
phrase Rare #19,797
can't come back Indicates that someone or something cannot return, often because of circumstances preventing the return. Depending on context, it can also mean “won't come back.”
CH: 天太晚了,他今天回不来了。
EN: It's too late; he can't come back today.

如果你回不来我会回来的

If you can't make it back... I will.

— 从海底出击 (1981)

他会回不来

He won't be coming back...

— 哈尔的移动城堡 (2004)