The future use and production of cars will be entirely constrained by the fuel (oil, biofuels, electricity etc.) available to power them. Conventional crude oil production is just about at its global all time peak, so it is only through alternative energy sources and more efficient vehicles that car usage can increase in the future. My car is diesel powered and European diesel is 5% biofuel. The car returns 70 mpg (imperial) with careful driving. (One one long journey I got 97.4 mpg on the trip computer). This is probably close to the limit for conventional vehicles. (meeting practical requirements for safety, production costs and general utility).
The future growth of alternative energy sources is also constrained, partly by price (what price can the global economy support?) and partly by physical limits (land and water to grow biofuels, etc.). At European retail rates ($7-$8 / US gallon) even gas to liquid and coal to liquid conversion is economic, but that is before the high tax rates are accounted for. Most vehicles can be converted to run on LPG or CNG with moderate cost and utility implications. But again, the limit will be the economic supply of the fuel. It has many other uses.
Oil consumption for transport in OECD countries has been falling since 2005. This, I suspect, was the economic constraint that popped the financial bubble in 2008. From now on, the global economy is constrained by the supply of oil, not the other way round. The countries that did worst in the 2008 crisis (Portugal, Ireland, Italy, Greece, Spain etc. ) were precisely the ones with the highest per capita oil import bills. Italy saw a 30% decline in oil consumption.
Electric cars as yet fail on the capital cost and utility scores. 1 year old electric Nissan leafs can be bought for less than half price, no shortage of vehicles on the market. Clearly early adopters are underwhelmed. Until price falls and utility rises they will not compete on an open market.
Globally car production will follow the global economy, and that is a rapidly diverging one, with rising poverty and exploding wealth gaps. Luxury and prestige car markets are booming, the most fuel efficient mass market manufactures are facing bankruptcy. The Chinese market is booming, but it is only a matter of a few years before they hit their own financial collapse.