Even if they don't lobby for them, insurance will very quickly make them the only option. Eventually, insurance cost for manual cars will be many times greater than the one for self-driving cars, making all manual cars prohibitively expensive to drive - and then after another decade or two of that, the percentage of manual cars left on the market will be so tiny,that they will be banned altogether, restricted to race tracks and private property.

What is your reasoning for why insuring manual cars would be any more expensive than it is now? If anything, it would be less expensive since those cars are sharing the road with safer self-driving cars.

If manual cars were comparatively more expensive then psychology might come into play and people would be reluctant to go for the more-expensive manual option.