Those numbers for future purchases are pretty interesting, particularly if you consider where they lead. If those numbers hold relatively steady, then it suggests that Blackberry is doomed to drop below 10% of the installed base, and that Android won't ever be able keep hold of an installed base even one third the size of the iPhone's.

In reality, a platform declining as steeply as Blackberry will probably accelerate it's decline until their only remaining customers are those who are locked-in, unless they can make their phones much more enticing before they've lost too many customers.