Yes, that will be a problem for BlackBerry even though, as you point out, many apps are worthless. (Plus, really, how many do you need?)
But the issue is whether BlackBerry can pry away iPhone and Android customers. Those people need a reason to abandon their mobile platforms. Offering fewer apps won't be a compelling reason. In fact, I'm not sure there is one, despite some good reviews for BB10. BlackBerry's only realistic target market (at least in the U.S.) is disaffected iPhone and Android users. At this point that's probably a small market.
Answer
Yes, that will be a problem for BlackBerry even though, as you point out, many apps are worthless. (Plus, really, how many do you need?)
But the issue is whether BlackBerry can pry away iPhone and Android customers. Those people need a reason to abandon their mobile platforms. Offering fewer apps won't be a compelling reason. In fact, I'm not sure there is one, despite some good reviews for BB10. BlackBerry's only realistic target market (at least in the U.S.) is disaffected iPhone and Android users. At this point that's probably a small market.