It means that we have to go through another ~2 years of fixing crappy drivers with only ~10% of developers actually supporting it.
No, as developers already got enough time/experience fixing the DX10 drivers, improving DX11 drivers should be a lot easier, because DX11 is basically DX10, just faster, because it uses multiple cores...or something like that. No actual graphical improvements are to be expected, at least no huge. DX11 is mainy about improving performance.