I'm no expert in presidential utterances but it seems a fair amount is admitted in the President's answer you quoted.

And so the strategy is to recognize that dependency upon crude oil is ....we need to diversify away [from crude oil] as quickly as possible.

All the more reason for us to diversify away from crude oil.

If refinery capacity is the real culprit, strong talk about diversification doesn't seem appropriate. In fact, he is a little tentative about the refineries.

we can build more refineries to increase the supply of gasoline, hopefully taking the pressure off of price.

Can we read this as simply saying: whatever the cause, there is no trusting oil-derived energy going forward?

Bush knows whats going on.  From his answer it is clear that he read the following:
http://www.theonion.com/content/node/51567
"Wife keeps driving to Kroger every day for some goddamn thing" LOL!!!