There are two issues with that logic:

1. Yes, probability of gmail data loss is less than probability of desktop mail data loss.

But that's for the average user. An individual desktop mail user can improve his probability to a higher level than gmail if he chooses.

2. Google may lose your data due to unexpected account termination as mentioned in the story above.

me too but the point wouldn't be trusting someone more than google, it would be to have an alternative if google locks you out...