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It's possible but again running rich in a direct injection engine can cause much more long term problems than running with a normal a/f ratio.
A rich condition will increase the amount of deposits that build up on the intake valves. This is already a known issue with DI motors. In a nut shell, the DI motors don't flush fuel through an intake rail, which in the past, this is what kept the top of the intake valves clean. By introducing a rich condition I think that would speed up the deposit build up. You can also run into other problems related with the emissions systems like the catalytic converter. Not to mention increased pollution.
In the end though we'll probably never know.
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