I think if nothing else we're going to need his experience and leadership for this run in. If we're going to survive in this division they're going to be invaluable.
But sadly you're right, he is coming towards the end of his career and he's the one that's made us tick for a few seasons now, (Christ, he nearly kept us up when he had Pelupessy 'playing' in his shadow all season.)
Going to be very difficult to replace imo.