In this exchange I'm a bit confused as to what the それ is actually referring to. In this conversation they were trying to convince him to go with him and the 嫁達 to a 温泉 and after much persistence(other stuff before this part of the exchange has been removed to keep it short) he eventually gives in and gives the excuse/reasoning 嫁達の健康と笑顔には変えられん. Now normally I'd think that それ would refer to the actual utterance itself but I can't see it literally referring to the previous utterance apart from the fact that it's basically 流星 agreeing to what the other person had suggested(i.e 温泉で嫁達の喜ぶ姿をみたい). Can anyone explain exactly to what それ refers to in this situation?
edit: Does it refer to 流星's desire (温泉で嫁達の喜ぶ姿をみたい) Does it refer to 流星's acceptance of his idea Or what does it refer to?