Really tough to say about 10 years ahead.
Overall sales will be up, there is some emerging credit card countries that would be rather strong by that time, possible we would have fingerprint payments introduced by that time.
Would be sweet and easy to pay for individual movies this way rather then memberships.
SMS payments is also growing strong, possible it would have been replaced by similar payment methods from your mobile, a lot of content would be streamed from a mobile with build in projector or similar thing that give you the option to view movies in the air or the wall as 50" 3d animations.
In a couple of countries IP payments would be introduced as well, you will be charged based on the either time your IP access premium content or the bandwidth consumed by your ip. Such things is already in alpha stage and would most likely be workable in 1-2 years.
In less than 2 years revenues from europe will be at the same level as USA, likely in 5 years USA will be only 35% of your sales. That is for those that knnow how to divert their marketing, it would mean translating your sites into the biggest languages such as spanish, french, german, russian etc. That is languages where the native speakers usually have a lot of difficulties speaking english. Also you need the local billing options available such as bank, debit, sms/phone.
If you are not capable of that you will see a lot of domestic or euro companies picking up those sales instead. And guess what! It's already happenning
I could be wrong, but I think most part is correct, it is difficult to predict the technology available in the future, I will for sure still be here the next 10 years and will continue to adapt to the market. Those that try to adapt the market will not be here