Do you have any solid sources for the "huge swath" of people being enabled by this to migrate from Windows to Linux?

The only thing that will enable people to migrate is third-party app support; no matter how good Linux distros get it's all moot if the software users use every day doesn't support it.

No. Source is me. I am the anecdata. shrug It absolutely can be wrong, but to me the pattern is relatively clean. Most of the converts I have seen thus far were Windows holdouts.