Expressing a desire or suggestion for a particular outcome; 'it would be good if', 'should', 'I hope'.
Long explanation:
The ~たらいい grammar point is used to express a desire, suggestion or hope for a particular outcome. It can be translated as 'it would be good if', 'should', or 'I hope' in English. The formation is simple, and it is used with verbs in their casual past tense form.