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It's one of those things that "Isn't a problem until it's a problem". Lots of owners abide by the factory intervals and have no problems, then some owners' engines blow up. Who's to say it's an oil quality issue?
With that said, I believe a year is too long for oil to sit in an engine- regardless of miles driven. Could that be the cause of bearing failure on a 17k mile engine? I seriously doubt it. S65 engines have inherent bearing issues. Some engines are worse than others. I've never opened an S65 that had conventionally acceptable bearing wear. It's not an issue derived from oil change intervals so don't sweat it.
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