More licenses have been proposed before, and there was not a lot of excitement around it. There is always the argument about which licenses.
Users can always have their own templates with any license by simply copying a file into the right directory and thats probably a better approach (full disclosure, thats how I do it to get Apache) rather than extending the list of hard coded licenses.
The even better way would of course be for the list of licenses to be taken from files in a directory the way the templates are done. This has been suggested on previous PRs extending the hard coded list. Maybe you should look at that solution.