What real estate and currency have in common, both being asset classes, is that they're a store of value. Currency has other properties (medium of exchange, unit of account) that Real Estate does not. People aren't meaningfully trading real estate as a medium of exchange or using it as a unit of account. So it's not even close to a currency.

OP might mean that Real Estate has become a leading store of value, on par with currency, due to the factors he outlines.