David makes a good point. If the Tokitae is the problem, then it seems a second ferry of equal size would only make things worse. On the other hand, I'm not aware of any requirement that prohibits ferries from leaving before they are fully loaded. Many people reported that happening last year. Perhaps ferries just needs to be more rigid with its schedule keeping, requiring the larger boats to maintain the 30-minute schedule no matter what. That way they'd at least do the same job as the 124s but still be capable of taking on more cars when possible. Even if they only had time to load 10 more cars per load as opposed to the full 20, that's still 10 less riders waiting at the dock. 
I wonder if the larger Olympic-class boats are really slower, and did actually transport fewer cars last year. Good questions for sure, ones that I'll ask!
—Justin Burnett, editor