While this is true in all mediums I think anime faces more of an uphill battle because the range of what's considered "acceptable subject matter" for the medium is extremely limited compared to say books (obviously), or movies, or even video games. The preconceived notions of what 'anime' is are far stronger.
Well, anime is a much smaller business, so it's easier to get the perception that it's more restricted on the production side unlike other industries, but is that really the case?
I'd say the amount of people willing to "stick their heads out" like Oshii mentioned is proportionally about the same as in those industries you mentioned (and in the case of the game industry, perhaps even more so).