Not just developers, but users as well. 90% of my ipad usage is with 2 apps - Netflix and Kindle, and now Apple is threatening to mess with them. I am not amused.
Let's see the numbers for books on Kindle and compare notes.
Kindle is a tougher call. I think Apple may try to pull them and see if they can do it or not.
That depends on whether or not you believe what Steve said in the keynote about having over 90% of the tablet market.
I was addressing the claim about market share and only that.