Well, to begin we should update typeshed's README.md, which still states
NOTE: When you're contributing a new stub for a package that you did
not develop, please obtain consent of the package owner (this is
specified in [PEP
484](https://www.python.org/dev/peps/pep-0484/#the-typeshed-repo)).
The best way to obtain consent is to file an issue in the third-party
package's tracker and include the link to a positive response in your PR
for typeshed.
After that's fixed, we can start a social media campaign, e.g. the PSF and some popular core devs could tweet about this. Maybe we could produce a blog post explaining how easy it is to create stubs from an installed package and copy those into typeshed? (IIRC Jukka is a little hesitant until some issues with stubgen have been fixed; personally I think we shouldn't wait for perfection.)