They can always keep the platform and upgrade everything. I’ve heard nothing but good about that plane.
Why cant they make a stealth version?
Because of the shape of it. Those square wings, the boxy shape of the tail, the big jet engines hanging off the side of the fuselage... the shape was just made to return a radar echo. The only way to make that stealthy would be to wrap an F-117 around it. In other words, it's essentially impossible.