Hard to say.
I'm not sure an outline for that story ("Japan Triumphant") was even submitted, and I'm not that familiar with Star Trek: Phase II. I believe I have an outline indicating some post-season two story ideas which describes the episode idea further, but I'll have to wait until later in the week to find it.
Thanks for the info and the hard work researching and answering these questions, Harvey
And, a Spock-less, Kirk-lite, TMP aesthetic (but with a lower budget) series run by a Roddenberry who had already begun to lose perspective? Nah, I'll take the Berman series and the Abrams films over that any day of the week.
Honestly, I think it would have only been a matter of time before Nimoy showed up and him and Shatner became the center of the show.