To make a really big US movie you need to get your actors and script to a low cost "Canada" to really enjoy the tax issues.
Then move the product back to the US to have more expensive US staff work on the project with really expensive US private sector super computers.
The script is easy to find. Actors exist in every state in the US with great talent and skills.
The super computers are still too expensive per frame per artist in the USA.
The ability to transport an entire crew to an international "Canada" like location to enjoy complex tax considerations is also a cost with the risk of local currency changes over the duration of the project.
The risks for the USA are:
Other nations with good support, gov "funded" private sector super computer services and lower all taxes on new movies.
If other nations can get that per frame art work cost down, parts of the trendy, creative USA could face real cost issues per project.
Ireland, England, Australia, New Zealand, Canada could just make that low cost happen by funding local artists, experts with the projection that long term tourism covers the digital "students" art costs.
How to win:
Anyone can find US actors, a new script. That US only super computer network that makes nice art still per movie is still too expensive.
So make movies that don't need a lot of fantasy, avoid the advanced computer work on every frame or get other nations to pay for the complex art.
Thats limiting. Find other ways to cover computer costs.
Invest in nations that welcome artists making complex movies and have the gov assistance to really prove their support of the arts. Nations that will do anything to create new hi tech local jobs.
Don't hire any actors from such nations but use all their services and see what gov support is on offer. A US company has more control over US actors who get strange ideas about wages, conditions, work place safety, the later "sharing" of profits... Local actors might have too many legal rights or even access to expert lawyers, unions in their own nations.
Enough US actors to pass as a US movie. Enough of an international crew to get international tax rates and art support in nations desperate to tax payer fund their own computer and art students.
Return to the USA with a product that will sell domestically and enjoy the international tax rate and low cost "educational" support other nations give away.
Its not gov funded art in some other wealthy nation. The project helped poor computer students in a poor nation with their first big "special effects" movie. It just needed free super computer time the gov had on offer for their poor students for a few months, years
In a historical perspective why stay in the USA and pay for a Video Toaster team when another nation will totally fund a complete 3D animation and rendering package?
No more US artist/engineers needed per frame, the costs are lower, the product can sell in the USA and globally.