I think the primary value of a project like this is the demonstration that this is possible and a proof that it does not incur some unknown tradeoff you'll discover after spending resources doing it.
IMO the maintenance story is more or less solved if you can keep AI agents refactoring and improving it in a loop.
> However not everyone has access to unlimited tokens
Apologies. I did not consider this when writing my comment, being spoilt by unlimited 'free' AI.
Free in quotes because, presumably, training agents on AI usage from developers is worth more than the cost of providing free AI.