I have a thread focusing on the Living Infrastructure:
http://www.peakoil.com/fortopic7259.html
We cannot get rid of automobiles without first looking at the whole living infrastructure of our society. The current living infrastructure cannot be without cars, trucks and other vehicles involved at great lengths. It is designated for that mobile get-arounds. Decades ago, cheap oil was the reason. Today and in the future, cheap oil will be gone for good (as oil become more expensive, unaffordable for the rest of the mass).
Your jobs and livinghoods will be affected by rising oil prices. Costs of foods and beverages will go higher due to transportation costs. Our local and national infrastructures are engineered for people moving about in vehicles. Markets and taxes are the big factors in affecting people's livinghoods and jobs.
Poor people who works in warehouses several miles away but cannot afford living in fine-looking housings near the warehouses (so they can walk or ride bike to work). Middle-class people have jobs all over towns or cities and get around by vehicles. People like to travel around. Kids like to cruise around in fancy, sporty or nostalgic cars. One grocery store may not offer the values and kinds you wanted within your housing area so you drive halfway across town to another one with better values.
Too many illegal immigrants are driving their vehicles without licenses. Many people don't give a f**k about what YOU think about them driving their vehicles, so in their words: f**k you. (This is not from me, it's just a general opinion of people who like to drive around and don't care about what others think). Many people LOVE cars and trucks and there are fanatics who are nuts about any or all types of vehicles.
Now don't get me started on motorcycle bikers!

Don't tell them to abandon motorcycles because of peak oil and you'll get a horde of mad bikers with chainwhips, like it's straight out of Mad Max movies.
Before you eliminate cars, trucks and other vehicles in general, look at your current living infrastructure and how it is all designed, engineered, developed and structured for people, their jobs and livinghoods. Granted, in some small countries, it's different. In the US, it's very different and we have plenty of spaces in the US to expand the living infrastructure, albeit it cannot last forever.