Sprint Betting the Farm on EVO and BlackBerry Curve 8530 for Subscriber Growth?

It might seem like good news all around for struggling mobile carrier Sprint. Their press release gives the good news with a hard positive subscriber growth number.
Sprint Nextel Reports Second Quarter 2010 Results – Grew total wireless subscribers by 111,000 with best ever postpaid churn
ZDNet provides a bit of historical perspective regarding Sprint’s string of quarterly subscriber losses here.
Sprint adds 111,000 net subscribers courtesy of HTC Evo
In 2008 alone, Sprint lost 4.58 million subscribers. Their 2009 quarterly reports shows losses in every quarter.
Sprint attributes this positive subscriber count, in part, to their introduction of the BlackBerry Curve 8530 and HTC EVO. If this is true, and I’m not arguing against this interpretation, Sprint may have trouble in future quarter. You may have read coverage here and elsewhere how the BlackBerry may be hitting a wall in both mindshare and actual shares. And, the problem with betting the farm on an Android super-phone (like the EVO) is that Android superphones seem to be introduced on a weekly pace these days. The Droid X was just released and there are already discussions about Samsung’s Galaxy phones. Word is that the Droid 2 will be available soon. Then, there’s the new phones based on Android OS 3.0 perhaps as soon as this winter.