In the US, it already is. The IRS treats cryptocurrency like property or stock, in other words, it is an asset with a capital gain or capital loss once you sell it. This means you have to track your purchase and sale prices. Including when you sell a cryptocurrency to buy another. This includes whether you are trading it or accepting for goods and services.
If you have sold or converted crypto during the year, and are eligible for US taxes, you must report your trades to the IRS.
Please consult a tax advisor for your own specific tax obligations.