Loans no, not at all. Money transfer for coin is extremely inefficient. Volatility makes crypto a terrible place to keep money.
Besides, you're paying for the legal and institutional protection anyway. If crypto made money transfer more efficient, they'd use it and still have the value add of a large institution backing transactions.
I thought we were talking about the hypothetical situation where crypto becomes amazing and not at the current state? Of course, crypto can't replace banks as it is now…
That's only useful as a hedge for ETH. A mortgage where you have to put down 373% of the value of the house in liquid currency as collateral is not competitive in the slightest.
Besides, you're paying for the legal and institutional protection anyway. If crypto made money transfer more efficient, they'd use it and still have the value add of a large institution backing transactions.