Solid rockets had more carrying capacity at one sixth the cost of Saturn 5 at the time. Is the ultimate launch system rated human-safe a combination of spinlau

Solid rockets had more carrying capacity at one sixth the cost of Saturn 5 at the time. Is the ultimate launch system rated human-safe a combination of spinlaunch, solid rocket boosters to reach highspeed for airbreathing ram/scramjets and lastly transition from airbreathers to liquid propellants?