Contracts? Business Requirements? Customers? They aren't run by idiots like you who are too stupid to realize you are the customer and Google isn't doing this for you, its doing this for its customers.
Google loses money making this change, why SHOULD they do it, other than you think flash ads are a bad thing. (HINT: They aren't, flash ads are great because you can just not enable flash and you have no ads. You can not do that with non-flash ads, can you?)