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Business models are the most common stumbling block.
Most of the technologies are based on good science and engineering. The problem is in delivering the product or service to market. That is where most failures occur.
This technology works, but it will be seen how successful they will be in delivering. The high cost of oil helps in this regard. However, any long term dip in crude prices kills most alternative's ability to penetrate the market and sustain growth. Maybe we should tax energy to the level of many EU countries. Or maybe we should continue to subsidize like we do in this country with greater extension. Something to help alternatives find a foothold.
Also, too many people use the "there won't be enough of X to supplant all the oil needed" argument. That is what we are all about here on Ecomodder - to use less so that what we do get goes further. Use electricity as propulsion for local commutes and transport. Use natural gas for medium range routes. Liquid hydro-carbons provide long range fuels for aircraft and such. Do it as efficiently as possible and sustainability becomes plausible.
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