As for my two cents:
From what I have learned concerning the messianic era there will be no need for these other structures. I think that the message of these pictures is that the west will no longer worship the almighty dollar, or any other currency of the nations. The symbols of western economic strength include those mentioned, and places like Wall Street and London. As the Roman empire crumbled the Jewish people spread out and flourished, even despite our wicked 'brothers' Ishmael and Essaus attempt to keep us down.
When Moshiach is amongst us we will flee from the wealth and the base pleasures which the western cultures cherish. Once again the knowledge of Hashem will fill the earth like water fills the oceans. When we read the Passover Haggadah we are told that we are to believe that 'we' ourselves have lived through the exodus of Egypt. In order to visualize this we must be able to see the symbols of power being destroyed, as the ancient children of Israel witnessed the utter decimation of the Egyptian system, the world power of its time, it crumbled before their eyes.
Remember that our ancestors were asked to take a sheep, and keep it inside for a week, and to slaughter it. The sheep was a G-d of Egypt and thus we were commanded to kill their G-d.... This is remembered on the Shabbat before Pesach...
http://www.jewfaq.org/special.htm
Shabbat Ha-Gadol
Shabbat Ha-Gadol is the Shabbat before Pesach (Passover). Traditionally, this was one of the few times of the year that a rabbi gave a lengthy sermon (in modern times, we get one every week). The sermon was usually about preparations for Pesach, and this special Shabbat commemorates a preparation for the original Pesach in Egypt. Shabbat Ha-Gadol (The Great Sabbath) commemorates the 10th day of Nissan, when the Hebrew slaves took the lambs that they were going to offer for Pesach and tied them up outside their homes, to keep until they offered it on the 14th (Ex. 12:3-6). According to tradition, this was a dangerous thing to do, because Egyptians worshipped sheep, but miraculously, instead of slaughtering the Hebrews, the Egyptians instead fought with each other over whether the Hebrews should be sent away already.
The special haftarah reading for this Shabbat is Malachi 3:4-24. This messianic prophecy regarding the end of days and the return of the prophet Elijah is read at this time because it is believed that Elijah will return at Pesach. This is why we include a cup for him in our seder rituals.