Auto playing media is not something that should ever be allowed anyway. Apple forcing sites to respect their users is actually a great reason to buy Apple products.
Currently most solutions are to load a number of empty audio buffers when the user first clicks and repurpose those for auto playing content later.
If a user has visited a multimedia focused web site (eg: online catwalk show), why not allow them to opt in for that session rather than force them to have a cut down experience?