"Scalia was joined in AT&T Mobility v. Concepcion by Chief Justice John Roberts and Justices Anthony Kennedy, Clarence Thomas and Samuel Alito."

Big fing surprise.

The supreme court started class actions in the US, the supreme court ended them (in practice).

In reality though, your problem is with Congress. This had nothing much to do with class action lawsuits, and everything to do with the federal arbitration act and whether it preempts state law. Congress could trivially fix this by adding two sentences to the law.