Time horizon rationale for scale path: the jump from 20–30 to hundreds of APIs depends on the corpus accumulated during the cold start phase, which can only be collected by running real migrations. The data cannot be synthesised or purchased; it takes a full first migration program to generate.
The idea is sound. The core AI tasks are well-matched to available technology. The long pole is not the model — it is validation: the system can generate migrations faster than they can be verified, and verification is the gate to calling any migration done. Build the validation strategy before the first migration sprint, not after.