It's not the liquid helium that limits JWST's lifespan (as that's in a closed loop), but rather the propellant needed to keep it in a stable orbit. I'm no rocke

It's not the liquid helium that limits JWST's lifespan (as that's in a closed loop), but rather the propellant needed to keep it in a stable orbit. I'm no rocket scientist, but I don't imagine that would be much less of a concern around a further, possibly less stable Lagrange point.