The A1 (graviton1) instance type was introduced in 2018 and it's not available anymore for purchase, but I don't think they've forced anyone to migrate.
Customers will want to migrate anyway because the newest types offer much better performance and pricing. At which point AWS may decide there's no demand for new instances of that type and just remove it from the API.
Customers will want to migrate anyway because the newest types offer much better performance and pricing. At which point AWS may decide there's no demand for new instances of that type and just remove it from the API.