Indeed.
It's hard for me to imagine the "killer app" that can't be done on a platform that has a completely open web browser and a locked-down app store. Google Voice seems as close to one as I can think of and note the following things about it:
a) not THAT many people cared. You may think they did if you are a geek/work with geeks, as I am/do, but your perception in that case is way off
b) Apple's restrictions were circumvented via a web app
c) if such an app became important to have to enough people that it caused concern to Apple, they can easily change their policy at any time to allow it.
I mean, there are a couple of things I'd really like to do on my iPhone OS devices (ScummVM on iPad would be awesome... yeah, I know I could theoretically jailbreak) but these are really minor annoyances compared to what I get out of the platform. It's just a pragmatic choice for me, not a holy war. And I can quit anytime. Really -- my cost of switching away from iPhone is the cost of replacing like 5 or 6 $2.99 apps.
Jiggly boobs apps may be popular (within a fairly narrow niche), but hardly anybody is going to switch devices over that. It's something people download on a whim and play with for a couple of minutes then never open again. Welcome to the $0.99 software market. It's not good or bad, it just is.
I guess what I'm saying is just this: all the cries of "software freedom!!" as though it were a revolutionary political struggle ring hollow to me. This isn't Stalinist Russia that people are being saved from if they're convinced into buying an Android device instead of an iPhone OS device. There's literally ZERO chance that Apple is going to completely own the smartphone and tablet computing worlds. The great concern with Windows throughout the nineties was that their lone real competitor was going to go out of business and they'd essentially be all that's left and all devices would only be able to connect to them and, with the advent of the internet, they'd entirely control the publishing platform of the 21st century. None of that applies at all to this circumstance. We've won: the web is open. Now it's down to games and jiggly boobs.
So all the non-browser apps will always have plenty of places to be built. Innovation isn't going to ground to a halt. You're just as free to buy a non-Apple device as you ever were and you'll still be able to get to all of the same web services as you do on an Apple device. All your documents and file formats are still open no matter which route you go. All the options are good. So if this topic matters a lot to you, buy non-Apple. But all this talk about them being "evil" seems ... startlingly lacking in perspective.