If they succeed with AI it will be huge: it's basically not possible to do it today with humans, no matter how many people you put on the job.
It would be impressive of AI to make a 80% rewrite, though I fully doubt it would cover the 100% rewrite (disregarding long term support as well).
Why do you think it’s impossible for humans to rewrite word, especially even humans made it in the first place?
These guys puposely obscure controls and understanding of these products 100% to prevent you doing a port.
Just go open a microsoft word doc in the browser and look at the dom.
Despair! Horror!
They purposely obscured, google doc is another example they completly hide the dom!
I spent months fighting word processing systems and ended up shipping libre. There's almost zero alternatives without that becoming your entire company.
(Also, "Rust or native" is a strange dichotomy. What's not native about Rust?)