I kind of suspect that people who transfer their photos and music and whatnot over, manually, are very much in the minority compared to people who stream and use a cloud hosted photo app. And I’d suspect that a good handful of those that care enough to backup their files locally probably has OwnCloud or something similar running.

That said, such a shitty move. I can’t imagine it would be that much more bothersome to support high speeds, on a modern device. It is more than likely an ulterior motive to get those people to assimilate or leave, and then phase out the plug entirely, a move that will be mocked by every major Android manufacturer only to have it on all their flagship models a year or two later.