How can there be a replacement?
As has been said, either a mobility scooter or a coffin.
A last ride in a Morgan Hearse would be cool...if there was such a vehicle.
Of course there can be a replacement, there are plenty of open top cars that might allow one to keep on driving if the Morgan was too difficult to use. I love my Morgan but I don't get the slavish allegiance to a single Marque.