Given that Tom complains (and rightfully so) every chance he gets about games which allow too many players, and that he already stated that playing a full game is too long and recommended 5 players play one less turn, I doubt it.
That is, of course, assuming he has a say on the expansions Game Salute publishes, he did say he was no longer working with them at some point in the past.
I would never play one less turn. The game already feels too short in round terms. But long enough in length term so I wouldn't add any rounds either.