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400's and 750's might be good capacity sizes for racing classes, but seeing as the current trends don't support those capacities on the street, then it'd be more expensive, not less for those displacements to be adopted (and madness for 'Production' based Racing).
But... there are some well-developed 450 singles for Dirt-Racing - engines that would lend themselves well to being put in road-race chassis perhaps?
Looking at Irish road-racing, the Ryan Farquhar invented 650 twins proved to be a great middleweight racing bike developed around the humble Kawasaki ER-6. Not slow either!
I'm not saying these are answers, just pointing out that there are viable alternative powerplants to a 250 'Moto3' type single race-bike as a junior support class in a possible future WSBK / WSS programme maybe?