I think it is a rare failure for a 2009.
57K miles is more miles than the average mileage of failures for the earlier model bikes. Early bikes often failed in the 20-30K miles range.
You would probably get around another 57K miles is they had done a "summary" bearing replacement.
However, that they sourced a new shim is very suggestive that they took the time to measure for preload.
(That was a really good suggestion by Gordon).
No reason not to have full confidence in your final drive now.
BWM has had plenty of time to educated dealerships about what I termed the "classic" crownwheel bearing failure.
I chose that term to distinquish it from other final drive failure modes known.
That video was made around 2007-8 and was shown at the Midway Utah CCR in 2008.
There are some errors in the method but none of real consequence and the method remains a good one.
Credits to DMAN for first proposing this method on this site.
Opinions expressed by me in the video regarding the reasons for the bearing failure are outdated. Subsequent to making the video, data gleaned from rebuilding final drives and the input from experts in their field (mostly mechanical engineers on this site), we concluded that excess preload on the crown gear assembly was the culprit.
PS I've seen dozens of bearing retainers chewed up like that, but this is the first time it occured to me that someone was trying to turn the retainer into a Gordian Accordian.
For those mystified by "Gordian Accordain", google it...