Sure and borrowing $750k to buy a house is a nifty way for me to get $750k without having to pay income taxes on $750k worth of income. What an amazing loophole that gives me completely free money and no taxes!

What the government could do is stop loaning out money at 0% (i.e. printing free money which inflates assets, like stocks held by wealthy people). If the prime rate increased, the rate banks would charge on asset-backed loans would also increase, which would make it less attractive than just selling the asset and paying the capital gains tax.