I would agree with GD on the included expiration date in the original passage as a deciding factor. In AZ we passed a temporary 2% tax on food which is to last for three years. The expiration is built into the law. When it expires, I will not consider it a tax reduction.
Without a specific expiration date, there is no such thing as temporary taxes or tax breaks.
I would regard an elimination of the mortgage interest deduction changing the rules midgame. Unlike ISM, I do not think it will ever end. The back lobby (as previously mentioned by Strangler) and real estate lobby and a whole bunch of other lobbies would make it very difficult to do so. The only fair way to do it would be to grandfather those who purchased with the understanding that they can have that deduction, however I know that won't fly.
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