Hey OP I like you post. Im glad this post so far has not turned into a flame fest.
I am not sure what kind of business user you are referring to.
If you are referring to the casual business owner who has no IT department to answer (which for me doesnt count) or a business that does not care what goes on its network and allows any and everything, then these simple changes are good.
However if you are talking about corporate businesses that have large and restrictive IT departments, corporations that have to worry about litigation and such, corporations who do not allow personally owned devices on their network, then those changes are not enough and are the least of thing things the iPhone needs for corps.
I think the next itineration of the iPhone will address a lot of the things you mentioned.