1:144 is already there. Half the size of 1:72.
In ships, 1:144 is already supported by Trumpeter (LCM, Gato (two of 'em)), Dragon (LCAC), and RoG (couple of U-boats). Whats this Yamato post down the board? 1:144 is supported by the aftermarket (White Ensign, Nautilus Models, etc.). N-scale (1:160) is close to 1:144, and is supported by various railroad detail sets as well as Iron Shipwright. Dragon supports the scale with aircraft, as does Sweet, Platz, Trumpeter to name a few. Can-Do, Dragon, and Trumpeter cover the 1:144 armor scale.
Add to that the traditional ship modeling of 1:192 scale (metric 1:200). There are some, and growing, including an Arizona soon.
There is no real market for a smaller than 1:144 but larger than 1:192 (or 1:350).
We don't need another scale with more of the same subjects (Oh boy! another Yamato!). We need more and diverse subjects in the scale which are out there now.