I trust you. If you think this is what we should do, I believe you. Even if he fails, even if he is totally wrong, he will learn, if his wife communicates to him that she still trusts him, in spite of his failures. Only then will his fear become confidence, for there is nothing that is more motivating to a man than a woman who believes in him. First of all, it is better to be wrong together than right alone.
Failures can bring unity to the family if the husband and wife stand as one.
Secondly, if he doesn't listen and fails, the realization of how valuable his wife's insights are may encourage him to listen better the next time. Most women have the personality and the power to make their husbands submit to them and follow their ideas instead if his own. Doing this is one of the most destructive things a wife can do. Her husband will never learn, or gain the confidence he needs to lead the family. Lastly, since submission to one's husband is a command from God, He will bless a wife's obedience no matter what the outcome of the specific situation is.