I drove my buddy's last-gen RX7- what a track car (until the motor grenaded itself), and also drove a new RX7 in ~81. So I am familiar with the Wankel, and would certainly consider putting one in a Lotus 7 clone. I give Mazda full credit for exploring the concept. A fast, lithe sports coupe. Likely, the RX8 is as far as this engine can be commercially advanced.
But, I can't help wondering if Mazda could simply put one of its excellent Otto cycle motors with DI into the RX8, and give it a highway gear. Call it the X8, or whatever, but get away from the thirsty, buzzy rotary.