It depends how you define a suitable airfield for a diversion. A380s fly regularly to YVR so maintenance and possibly additional crew members might be available. It seems a reasonable plan if you are not sure all of your crew will be fit to continue. Also might be a familiar airfield for the A 380 crew. I had a potential diversion (passenger sick) last week and that was certainly a factor we discussed. If there is no immediate danger in flying a bit further, this might be the best solution for the passengers.