This should have been done decades ago, if only to serve the current circuit's residents better. As for politics, the indolent Obama and Clinton, and the inept micro-manager Carter should look on this as lost opportunity.
Back to practical considerations, the problematic parts of the current circuit are Alaska and Hawaii, which are geographically separated from the other 48 states. Perhaps they and other US possessions in the Pacific should be a circuit with 3-judge panels located in multiple points (e.g. Anchorage, Honolulu, Hagatña or Tamuning, and Pago Pago).