2) Europe has had high gas taxes for a long time, and they have benefited from them. This would be the perfect time to start a Carbon Tax precisely because gas is relatively cheap. What you are hinting at is Peak Oil, and I don't disagree with that.
3) Some things markets can't do, others it does badly. Economics isn't a religion, and economists usually favor a carbon tax. Doing this gradually makes a lot of sense. Waiting until a massive gas price spike cripples the economy and forces it just isn't smart.
5) For gas, we have an existing tax system, and that can be adapted. That's the easy part.
6) Carbon neutral is not enough, we need to slowly stop carbon emissions (where we can).
There are other ways of storing energy.
2) About the oil benefit Europe has from high fuel cost is much more efficient cars than we can buy in the US.
Peak oil is a bit of a misnomer, as there is a lot of oil out there, it is just not easy or cheap to get to.
I had a research project on a seismic ship in 1983, we ran past the Continental shelve in the Gulf of Mexico, so as not to disrupt
the working crews. We spotted a salt dome over 1000' high and 100 miles across.
It likely have more oil than the entire middle east.
It is just under 900 fathoms of water!
We can now drill that deep, but it is neither cheap or easy.
It is also not worth the risks, if the absolute ceiling for oil is about $100 a barrel.
3) No one is waiting for a massive price spike, the current low prices are a result of an over supply.
The fracked wells have greater output but shorter lives, and the supply will taper off quickly.
At today's price $49.89 a barrel, oil has come up about 30 % since the $28 low 12 months ago.
Oil will keep increasing because only a few will risk the expense of fracking wells,knowing the a real ceiling for the price exists.
5) I am loathed to offer our junkie of a Government any more of the narcotic they crave.
Even when gas prices were very high, consumption did not fall much.
http://www.earth-policy.org/images/uploads/graphs_tables/highlights38_gasoline.PNG
So giving the Government more money in the hope people will use less, seems counter productive.
6) Carbon neutral would absolutely halt new carbon emission in their tracks.
An example let's say in the year 2021 oil get to the limiting $100 a barrel number and the major refineries,
in order to make more evil profit, switch out half of their operations to making their own carbon neutral feedstock.
So 140 Billion gallons of gasoline will still be sold, but total carbon emission would be half.
The solar homes need a place to sell their surplus power, the refineries can buy all that is available,
and store that energy in their distribution infrastructure.
The end user may not even know they are buying a different product, only that after a few years, the price is stable.
We can talk about other ways of storing energy, but usually nature has selected the best method,
and we know how nature stores energy.