I think if Pres. Bush does something about the open borders and spending in his remaining years this term, he will go down as a great president. In any case, his response to Islamofascism will certainly ensure his place in the history books. That said, there is NO comparison between the four great presidents you mentioned and GW Bush (IMHO).
I agree 100%. Bush can do something to go down in history as a great president if he does something good in regards to illegal immigration, and finally decides to do something about spending.