Realistically, if the Queue crashes out with 17,000+ in it for whatever reason, the sensible solution to avoid players erroring out of the queue due to this would be to have the Login Server reject new connection attempts when the total Queue for the Data Center is 16000 or higher. "Due to severe server congestion, the queue is full at this time. Please try again in a few minutes." And only permit new bodies in the queue once it's below 16,000. Simple and sensible to implement, and would completely remedy one cause of these 2002 errors.

Then it comes down to the connection disruption 2002s (the ones in the part of the announcement OP quoted), and those? There's not a quick and simple fix to that one. That could be on either end of the connection or, more likely, some point in the middle. UDP is notoriously clumsy, and the more hops between you and your destination the more likely a packet gets misplaced. A bit like airports and luggage really.