Already in some countries in Europe a classic is prohibited from motorways and is limited to a few thousand km a year. This could happen hers, in the guise of "road safety and pollution".
Peter can you be more specific on this? I know about some cities restricting old cars from the city centre but if there is a country prohibiting my Morgan from motorways I would like to know which it is before I get in to trouble. As for restricting the number of miles driven in a year, I think that depends on whether you choose to register it as historic or pay for normal registration. In Austria for example my Morgan (and most cars over 30 years old) can be registered as "historic." This gives you cheap insurance and limits you to driving on 52 days in the year. But this is voluntary, not compulsory. One can choose normal registration and suffer no restrictions.
Auster,
I was under the impression, having lived there through the 1990s, that in Germany cars over a certain age had to be registered as historic, and then were restricted as discussed. But it only applies to cars registered in Germany. Not sure about France.
In the UK cars over 40 years old don't pay road tax, don't require a TUV, but are not restricted in where and how often they can drive. That said, most such cars are pampered pets, and are not driven excessively.