Even if you could somehow do this technically (without the ship blowing up when it hits a micro-asteroid), the fact only a short time passes inside the ship isn

Even if you could somehow do this technically (without the ship blowing up when it hits a micro-asteroid), the fact only a short time passes inside the ship isn't much help when it takes decades or centuries for the ship to get to its destination. Even at light-speed with no accel/decel time, a ship would take 4 years to get here from the nearest star system (Alpha Centauri).