1. We are at or near peak oil, which means that in the near future the same amount of oil will not be available at the same prices, and sooner or later it's going to be used up.
2. Therefore, we must change our way of living now: sustanable cities, less use of cars, local production, etc.
But there seems to be a huge disconnect there. If it is indeed true that in the near future the same amount of oil will not be available at the same prices, then the problem solves itself: Raising prices will cause changes in lifestyles. For example, the more expensive petrol is, the more motivated you are to take the bike rather than the car. Also, the higher the price of petrol, the more companies are motivated to offer machinery that uses alternative sources of energy.
As a consequence, if the empirical assumption is true, then there is no need whatsoever to campaign for lifestyle changes, because they will be brought about automatically, via the price mechanism. If you see these lifestyle changes as desirable anyway, you should be quite happy about peak oil, no need to panic.
So, what am I missing?