Thanks for you responses. Fern, I think it would be unreasonable to expect a TA to be available 100% of the time. But this is not a one person agency, and I feel they should provide someone to contact.
Mike, we booked the entire vacation thru the TA. Air, transfers, insurance and cruise were all booked thru her with the assumption that it would be safer. Shore excursions were the only thing we handled ourselves and we did that onboard and stuck with the carnival excursions. First timers, better save than sorry.
From reading the story on the home page of CM's, it appears that a TA is still the best option for cruise planning.