I would never point to Rob Green as an example of good goalkeeping as that guy is liable to implode at any time.
However, the defence is a unit, and if Samson isn't going to come off his line, others need to deal with that. I mentioned in another thread that Jim Leighton made a career out of never leaving his 6 yard box or catching a cross. His defenders knew that, and Big Eck and Willie Miller took care of it instead.
Of course, that was a particularly high quality defence, and I'm not pretending ours is as good, but there is no reason we can't adopt the same approach. I suspect it's easier to teach a defender to sit deeper and clear those balls than to teach Samson to catch them.