I didn't say you wouldn't learn, I said it would be an extra cost, which it will be. Its about time flying schools shared this additional cost, if for no other reason as a sign of goodwill toward the student. You always learn something new from a different instructor but the change is disrupting there's no getting away from it.
It is accepted that instructor jobs are usually more to do with hours building then a life long career but I do wonder how many new students are made aware of how mobile a lot of instructors are.