I disagree, as a web developer big or small it is your job to set the standards for what the web should be.

Small freelancers make up a greater percentage than bigger firms as developers. At very least you should make it known that supporting old browsers is not a standard service and will incur extra costs to the client. There is plenty of literature to point your clients to in order to back up your point. If we all do this one by one it will have a greater impact than this move by Google.