At the altitude at which a Mach 10 hypersonic aircraft would be flying, the ejection would be very survivable, the reentry into the atmosphere in just a pressure suit, not so much.

Mach 10 (approx. 7,600 mph) is not considered survivable for a human in any current or projected manned aircraft without revolutionary protective technology. While the 2022 film Top Gun: Maverick popularized the idea, real-world physics present two lethal hurdles: G-forces and thermal stress. To reach Mach 10, an aircraft would generate immense acceleration; any sharp turn or slight maneuver at that speed would subject the pilot to G-forces that would instantly "obliterate" the human body, causing fatal internal trauma and immediate blackouts. Furthermore, at Mach 10, friction with the atmosphere creates temperatures exceeding 3,000°F, requiring a cockpit that can perfectly insulate a human while remaining structurally sound. Additionally, ejection is impossible at Mach 10; the sheer air pressure would shred a person instantly upon contact with the outside air. Currently, only unmanned experimental vehicles and re-entry spacecraft reach these speeds, as the "human factor" is the primary limiting constraint on hypersonic flight.