Or 300,000 per person on the planet in 2033
The speculative price in terms of dollars doesn't particularly matter. It is the trust in the network that the transaction is good and verifiable that gives the currency value.
What is the value of trust?
Do you trust banks and governments to value your goods?
As the dollar becomes less and less trusted around the world and as the number of them in circulation increases, people will flee from it anyway. It's backed by the "Full Faith and Credit of the US Government" in other words blood shed and exploitation of resources. In other words, if you don't trust the dollar as a system of valuation, we'll kill you.
What people will be looking for is a trusted way to transact.
The problem with tying it to energy prices is that energy prices, while stable, are still centrally determined and the price of which is subject to the manipulation of energy prices through speculation. The problem with Bitcoin is that it still relies on an external valuation system, that of what the people who issue currencies think stuff is worth.
What happens when distributed generation is achieved?
http://openfarmtech.org/weblog/2010/10/distributed-generation/
http://openfarmtech.org/weblog/category/global-village-construction-set/steam-engine-construction-set/
Right now through centrally issued currencies the price of things is determined by a minority of people. In Bitcoin, it requires a majority of people to participate in the valuation of things.
Is deflation bad?
The effects of deflation are:
Decreasing nominal prices for goods and services ( I like cheap stuff)
Increasing real value of cash money and all monetary items (I like when $10 buys lots of cheap stuff)
Discourages bank savings and decreases investment (Money actually circulates in the economy rather than being horded)
Enriches creditors at the expenses of debtors (Isn't that why we're here? To enrich ourselves rather than our creditors?)
Inflation reduces the real value of money over time; conversely, deflation increases the real value of money.
This allows one to buy more goods with the same amount of money over time.
The problem you are talking about arises from the issuance of currency. Deflation is correlated with depressions – including the Great Depression, as banks defaulted on depositors. Not all episodes of deflation correspond with periods of poor economic growth.
In modern economies, deflation is usually caused by an induced drop in aggregate demand, artificially created by the currency issuer to induce a recession and (more rarely) long term economic depressions, so that those with money can buy assets at fire sale prices before prices are artificially inflated again.