The U.S. Constitution was designed to restrict what the government could do to those it governed. The Founding Fathers were more concerned with what people who held power could do when that power was arbitrary and unchecked.
The problems with government we have now are not a matter of not finding or identifying the right experts, because the system of government was originally designed to allow experts to function independently of government. The chief design flaw in such a republican democracy is that it depends almost entirely on the morality of its citizens. This system of government could never hope to control a selfish people out to "get theirs". It could never hope to maintain itself if the representatives were chosen for the bacon they brought home rather than the recognized desire to preserve the individual liberties of fellow citizens.
In selecting representatives it required only that we recognize forthrightness, honesty, and the prioritization of individual liberty over governmental power. But in order to recognize that in others, those same desires and convictions must be present in those doing the selection. When the majority no longer select along those lines, but select on popularity or out of some notion of personal gain, we get what we starting to see now; arbitrary power exercised by the capricious and corrupt.
We don't have a total loss yet, of course. We're not close to being the most corrupt country on Earth, but we're not the least corrupt anymore. Our education, in particular with regard to the notion of individual liberties as innate and not granted by government, is sadly lacking now. If we don't teach the importance of the system of government, and we have a complicit media that continues to deliver the message that the Constitution is just some piece of paper that is no longer useful (or worse, means what we decide it means today), then selection of representation will be poor.