Wheel Bearing Failure

Preventative maintenance saves another breakdown.....
How much longer before this would have been a REALLY big problem?
The ole' land yacht has been together for about 12 years now. I decided it's time to take the front drums off for the 1st time since putting her together. I've only driven her about 15k miles in the 12 years. Brakes look perfect, grease seals are good, but the outer wheel bearing on the right side came out like this>>>>>