Democracy or oligarchy?

From a comment at cafehayek by David White, I learn:

The Constitution was framed for three million people in thirteen sovereign states. When the first Congress met in 1790, there was one representative for every 30,000 people. By 1920, the U.S. population was 90 million, and Congress capped representation in the house at 435, where it remains today. Now, however, there are 300 million Americans, yielding a ratio of one representative for every 690,000 people. If we apply this ratio to 1790, there would have been only four members in the House of Representatives. Or, to put it another way, if the ratio of the framers existed today, there would be 10,000 members in the House.

The Danish development has been similar, if somewhat less extreme. In 1849 the Danish Rigsdag had 151 members, 100 in the Folketing, 51 in the Landsting. Today the Folketing has 179 members. Back in 1849 Denmark had appr. 1.4 million inhabitants, or 1 representative pr. 9300 people. Today she has appr. 5.45 million inhabitants, or 1 representative pr. 30.000 people.