Sentence 1 is uncoordinated and fragmented. In the event that this situation occurs (highly unlikely)...it will improve improve things (highly favorable, my behavior is an anticipated result). Disconnected from language, they are also disconnected from reality.
話し手がどのような行動をとるか聞き手としては判断できないということになります。
そういう意味でこの文は明確な情報を伝えることが出来ませんので、「ナンセンス」な文といえると思います。
*English lesson*
It would have been better if it had rained yesterday.
3)もし昨日雨だったならば、それはもっと良くなっていた だろう(に)。
It would be better if it had rained yesterday. Time shifted back as it is being reported. From the vantage point of when you are speaking, you know it didn't rain (or at least the premise whether it rained yesterday or not for certain if it is true). The condition of getting better, though, is simultaneous or future with respect to the action of the main clause....
わかりました。ありがとうございます。 ...!