[WorldMaker]

All browser font systems already prefer locally installed fonts to CSS @font-face lookups.

The tool SkyFonts (from Monotype foundry and recommended by stores like MyFonts.com) as one of several features as a "cloud font updater" includes a "download the top X Google Fonts" option. It's an easy way to get a faster page load experience on the web.

The problem to watch out for, and it is why it's not generally recommended, is that font loading times are already in the wild a privacy issue (there are fingerprinting tools out there that try to download fonts and draw them in an off-screen CANVAS, using "too fast" as a deanonymization vector).

The best bet to generally help the web at large would be a browser or OS vendor to start installing the Top X fonts from Google Fonts out of the box.