It was a bit of a chicken and egg problem: there was no incentive to have a decent terminal since+because there was no decent shell+platform. IOW the command line was a rudimentary tool, an artefact from the past, not a central piece of the experience. PowerShell barely moved the dial, but now that there's a trend towards the Unix experience, that may very well bootstrap some more glorious CLI days on Windows, which may even benefit PowerShell in some way.