Oil isn't going to suddenly dry up next week... the current issue with rising fuel prices isn't due to a rapidly shrinking supply, but a supply that can't meet the growing demand for a highly inelastic product (but historically oil has been inelastic only in the short-term; in the long-term oil is a fairly elastic good). There are still decades of supply left.
There will be no energy crisis since there's ample supply of alternative energy, whether renewable- solar, wind, biofuel, tidal, etc... and non-renewable- nuclear, coal. The 'energy crisis' is actually a fuel crisis, and given the current rate of progress in biofuels, hydrogen and battery technology I doubt there will be any technical difficulty with solving the problem.
The issue will be infrastructure- modern fuel infrastructure is entirely designed around the production, refining and consumption of petroleum, principally gasoline. Certain aspects can be repurposed to new fuels... for example TDP and other biofuel production methods don't rely on any really new chemical engineering. The same technology and infrastructure used currently for refining could be adapted for these technologies, and likewise distribution systems (pipelines, tankers and gas stations) and engines require little change to use these fuels. And who knows, maybe someone will figure out a brilliant way to store and distribute hydrogen. Personally I'm rooting for...
What's more interesting is the question of plastics, since most plastics are derived from oil. However there are more and more bio-plastics being developed (like that nifty self-repairing rubber announced recently).
The 'energy crisis' and 'peak oil' are nice bases for a plotline, or a scare story to achieve political gains, or ratings if you're in the news biz. But it's not something I would worry about.