HTML may represent new business for adobe. HTML5 has more to worry about from O/S vendors and browser makers in my view. An example of this is indecision about video codecs. A rich html spec makes life easier for adobe: their primary business is tools (I was told this by a Flex evangelist as he gave people copies of the FlexSDK).
Although Apple's policy is beginning to worry them, it reads more like a HTML5 is a complementary technology rather than a competitor.