When I hear "digital" I don't exactly associate long-term preservation with it. Do you also have a strategy for the "digital preservation" part? Websites don't live long. Storage media don't last long either.

Should such a program be made together with a partner that has a strategy for long-term (outlook of centuries) storage of digital content? Because otherwise I don't see the "preservation" aspect. The monuments will likely survive all the digitized data created from them, easily.

It's not just the data, but also ways to use it. Imagine this was done twenty years ago and it was all saved as Adobe Flash media.

I think preserving the digital media plus ensure that it will still be usable (hardware and digital format) is a monumental effort, in comparison creating the digital representation is not the hard part.