This is really more of a query than an opinion - must be losing my grip.
Are you sure that the state of our - let's say "averagely" bumpy - roads really wears out dampers more quickly than would happen on smoother roads? It seems to me that the damper internals - valves, seals, and so on - are being jiggled about continuously - even on the smoothest surface there must be constant movement. The same goes for the suspension bushes, anti-roll bar bushes, and so on. If we drove on very smooth roads all the time, all the wear would be concentrated on a very small part of the rubbing surfaces and I'm not convinced that the amount of fluid passing through the valves within the damper would make a difference to them. Very large movements, which take the suspension to the limits of its travel in either direction, might cause damage, especially if the driver is either caught unawares or doesn't have the common sense to slow down; however, I'd like to suggest that moderately bumpy roads, causing substantial suspension travel, could be better for the wearing components in a suspension system than very smooth ones. And there's a clear case for cornering on the door handles to spread the wear on anti-roll bar bushes.
