I think long term, fuel dilution will become a problem...it's a gradual thing. Fuel will reduce the lubrication properties of the oil - I'd worry about ring and bearing wear. Gradually. Then you'll have your oil burning, excessive blowby, eventual loss of oil pressure, loss of power...all things that eventually happen to an old engine with lots of miles (only sooner).
I think it's going to be real interesting to see how DI engines are long term, like when they reach 200,000 plus. And I know I have "re-thought" my oil change strategies since owning my first DI engine five years ago. I no longer do the 7,500-10,000 mile oil changes. My last DI engine began "using" a lot of oil after it reached 150,000 miles. And when it reached 175,000 it got much worse, to the tune of a quart every 700 miles. Then I traded it in. I'm on my second DI engine now, I keep my oil change intervals to 5,000 miles using a recommended Synthetic and quality filter...will that make a difference? Well it better, rather that or I'll just keep adding oil this time around...I'm tired of buying new vehicle, plan on keeping this one till 300,000k.