While we may obviously draw many principles from the Old Testament because all Scripture is 'profitable,' all Scripture is not applicable to us as members of the church, the body of Christ. Unfortunately, there is a lot of heresy taught in pulpits in the name of application which often amounts to twisting Scripture to promote an agenda whether personal or corporate. Here the Lord appealed to His covenant promises to the nation and challenged Israel to bring the whole tithe into the storehouse so there would be adequate food for the priests. These blessings simply awaited their obedience. The church building is not God's house as was the temple.
Believers are the temple.
Obviously, there are legitimate applications of the Malachi passage, but insisting that believers give all that they give to the local church is, in my opinion, manipulating the passage for our own agendas. Pastors and church leaders want to see the budget grow to meet the needs, so this passage is sometimes used to coerce believers into giving strictly to the church. Giving for New Testament believers is not a set amount and it is a personal matter that is to proceed from one's relationship with the Lord, as led by the Spirit. In my opinion and based on 2 Corinthians 8 and 9, there should never be any kind of pressure or coercion to get people to give either a certain percentage or to a certain need. The New Testament nowhere tells us that giving to the church is the only way to give to God.