It seems to me that there are two kinds of apps: the "top 100" apps and "the rest." If you have a killer smashing out-of-the-ballpark idea that will be "top 100", go ahead and be a startup.
For the rest, it seems to me that App Store economics just don't provide enough profit for overhead (personnel and investors needing return on investment) of the traditional startup. One or two-person self-employed shops survive. Great news if you want to be self-employeed and have a good idea; Terrible news if you were planning on winning the startup lottery.
EDIT: Need to point out the above is opinion unfettered from the constraints of fact. I welcome news of facts which refute my guesses.
For the rest, it seems to me that App Store economics just don't provide enough profit for overhead (personnel and investors needing return on investment) of the traditional startup. One or two-person self-employed shops survive. Great news if you want to be self-employeed and have a good idea; Terrible news if you were planning on winning the startup lottery.
EDIT: Need to point out the above is opinion unfettered from the constraints of fact. I welcome news of facts which refute my guesses.