I think are you exaggerating a bit there. I doubt that a large fraction of our users are using any non-Debian repositories. Of course I don't have evidence so if you have any contrary to this I'd be pleased to see it.
The popcon results posted to -vote a few days ago showed the top non-free packages were either never available in Debian (several java ones) or were long ago removed (acrobat reader).
Of course, all the problems with popcon apply.
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