It is wishful thinking to expect deeper change under his leadership.

指望在他领导下有更深刻的变化是痴心妄想。

I've got a feeling that Alex likes me, but that might just be wishful thinking.

我有一种感觉：亚历克斯喜欢我。但那可能只是我一相情愿的想法。

It's only his own wishful thinking.

这只是他自己一厢情愿。

That is probably wishful thinking.

这可能只是一种痴心妄想。

This might be just wishful thinking.

这可能只是一厢情愿罢了。