Most remaining major RHD markets are physical islands (Japan, UK, Australia, most of south-east asia) or cultural islands (Japan, India). So long as enough manufacturers can continue to make most cars with steering wheels on both sides, there's really no pressure. It's a total non-issue.
And once cars are driving themselves, they won't need a steering wheel on either side. Maybe this might take 20 years. Maybe it will take 40 years. But with the rate of progress in ML we're seeing today combined with the fact that the death toll from human drivers is a million people per year, it's a practical inevitability.
It also shouldn't be that big a deal --- Subaru was willing to do a run of vehicles specifically marketed to U.S. Rural Postal Carriers (while ostensibly it was a run of the vehicles they were making for Japan already, it actually required some U.S. specific labeling and emissions equipment and so forth).
And once cars are driving themselves, they won't need a steering wheel on either side. Maybe this might take 20 years. Maybe it will take 40 years. But with the rate of progress in ML we're seeing today combined with the fact that the death toll from human drivers is a million people per year, it's a practical inevitability.
(I live in Australia, FWIW.)