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Interesting solution! While the patch itself looks fine to me, I'm not 
sure I like this solution much. It's fine to use this trick for list or 
tuple, but implementing it for all old-style classes at once seems a bit 
dangerous.
With this patch, it seems to me that the rule describing exactly what 
__getitem__ receives (for an old-style class implementing __getitem__ but 
not __getslice__) becomes rather complicated, and can no longer be deduced 
from the documentation.
I'd say leave the current behaviour as it is, and remind people that they 
should be using new-style classes wherever possible.