You know what, it's simple.
If the product overall does stuff you want the way you want, buy it. If there are too many negatives. Buy something else. If no one makes a close to ideal product for you, choose what's best or don't buy at all if you don't need it. I like my iphone. I'd be upset if Kindle was no longer on the iphone (I don't use it but I like the option particularly cause Amazon is cheaper and does have a few more books I want). But really, *for me*, it wouldn't affect me too badly (I use iBooks mostly). So I'd keep using it. When Apple does something to make the device truly unusable to me, I'll change. That's capitalism at work

.
Even if Apple stopped supporting Kindle, those with Kindle already and Kindle books will still be able to use what they have on the iphone. No one is saying Apple is going to go into your phone and erase the app (I have an app on my phone that Apple pulled and they pulled it because of a very big violation

. Apple just stopped them from selling more, they didn't go back and erase the app off of the phones that already got it).
Yeah, it sux you'd no longer be able to get more Kindle books on your phone. Oh wait, you probably could buy books off your computer's Kindle app and transfer them to the phone (I'm betting since Kindle advertises being able to read the books you buy off of one device you can read them in all there is a way to do this. I don't know, I preferred iBooks format though it would be nice if iBooks was as cheap and had more selection. For what I usually get though they aren't too lacking). This would really only affect those who hadn't gotten the phone for Kindle yet.
And you people comparing this to tyrannical regimes (the real reason for this rant)... Really?!!!! No one forced you to buy Apple. No one is forcing you to keep using that device. No one is saying you can't go buy an Android right now and set fire to your iphone. No one is putting a gun to your head, threatening you with arrest, threatening you with torture... Apple is just saying this is what they will make available for their device, take it or leave it. You are free to choose some other device (that will have its own limitations and stuff that you won't like. And stuff you might like better. That's the point, you pick which one does what you need best).
Shoot, you knew Apple liked control when you bought the devices. Let me tell you from some one who had the first Mac, this is not *NEW*, this has always been their way. If you don't like it, why aren't you already on the anti-apple train? I have friends who've been saying for years how they don't like Apple's closed system. This is far from new. This is a complaint Windows fans have had about the Mac way before the idevices got popular.
Get a grip... seriously.
(oh, and I really love the people blaming this on Steve leaving. Steve Jobs can do no wrong, right? This has to be some one else's fault).