In 50 years, OPEC will still have oil even at current consumption. But consumption is shrinking as energy production is already shifting to renewables and cars will have converted to electro/hydrogen by then.
2014: 92,086,000
2013: 91,243,000
2012: 89,846,000
2011: 88,974,000
2010: 87,864,000
Almost all that increase in consumption is attributable to Asia. Any downturn in the curve will be attributable to the economy of China slowing, not renewables taking the place of oil.
I don't disagree that the consumption of renewables is growing rapidly, but that doesn't mean they're making a dent in oil consumption. They may down the road at some point, but right now they're a spit in the ocean.
Also I am curious, do you have evidence that suggests consumption is shifting away from oil to renewables?
The yearly road tax for a "dirty" car where I live is about $1000. If that was 2k or 3k they would be off the roads within the year...