Could we do as the Samoans did 2 years ago and switch our driving to the other side of the road? The cost of altering the signage and access roads would be more than compensated by a sales surge in left hand drive vehicles.
By doing so we could show what good Europeans we are
What would be the point? As you say, it would be a costly exercise, and in the current economic climate, what proportion of drivers would want to sell perfectly good (but now unusable anywhere) cars to trade in for left hand drive ones? And, by the way, since I live in Germany, I have to drive on the right but manage quite nicely when I visit the UK driving on the other side of the road.
The only reason we have left hand wheels is because of bloody Napoleon - like a very large percentage of our leaders (Cameron, Brown, Obama, Bush Shrub, Clinton, JFK etc etc, they are/were left handed.
It is more natural to travel on the left, wheel on the right, historically because of the hand you used your sword/lance/gun or whatever portable weapon, the other hand controlling the hoss/donkey/coo (whatever).
Forgive me for being dumb but Samoa switched to the same side of the road as we drive on 2 years ago.
76 countries drive on the same side as we do including India,Indonesia and Japan..All big markets for our right hand drive car manufacturers :-)