It will take hundreds of fault tolerant qubits. That means it will take potentially millions of physical qubits of relatively high quality. There is a long road ahead from 72 relatively medium quality to millions of relatively high quality qubits.

As a layman, I've never heard of qubit quality. What is it exactly? How do you determine it? And why does it affect computation?

Qubit quality is defined by the quantum volume [0]. Errors that occur when gates are applied to qubits need to be below a certain threshold to perform error correction.

[0]: https://www.research.ibm.com/ibm-q/resources/quantum-volume....

Is quantum error correction really that demanding? I thought it was only a small multiple of the number of qubits, not orders of magnitude more.

How many hundreds? We are apparently at 72 qubits...sounds to me we are a year or two away from what you're saying

As your sibling comment pointed out, we still have a long way to go before we are able to make large amounts of stable and thus truly usable qubits.