My take on this is that it would be a better idea. If we're able to create more of a critical mass of people living Downtown, then the tendency is that commercial spaces get better used, since there's more incentive for businesses to be located in a place closer to a high concentration of potential workforce.
We might not end up with big, flashy major company HQs, but more people will increase the demand for small accounting firms, law offices, medical services, among other businesses and services that can occupy the vacant office space, little by little.