Re: The dogs bark; fact check @Andy Prough
Apple marketshare in Q2 2012 was 18.8%, with 28.9m shipments. As of Q2 2013 share had dropped to 14.2%, but shipments were up to 31.9m. Source: http://www.gartner.com/newsroom/id/2573415
So, Apple: marketshare down 25%; shipments up 10%.
Between Q2 2010 and Q2 2011, RIM's shipments increased from 11.6m to 12.7m. Share dropped from 18.7% to 11.7%. Source: http://www.gartner.com/newsroom/id/1764714
So, BlackBerry: marketshare down 37%; shipments up 4%.
I couldn't find Q3 2013 figures, but the quarter ended less than half a month ago. I picked the quarter in which RIM performed best.
By Q4 RIM were, year on year, at 40% marketshare decline and an 11% decline in shipments. So if your comparison is correct then Apple's fortunes should decline very quickly.
However by using Q3 numbers, I have completely overlooked any effect the iPhone 5S/C may have on Apple's fortunes. So I'd suggest that Apple's decline isn't going to mirror BlackBerry's. Q3 and Q4 will probably show significant shipment increases if reports so far about the 5S are correct; the question is how deeply sales will dip in the middle of next year when the bump of a new product launch fades again.