Democracy as such cannot be changed because it's a government of people,
by people and for people. The term has its roots in a Greek word meaning
"common people". Democracy " of people" is a form of government
constituted of the people who are to be governed. Democracy "by the
people" is a form of government that grants authority to one of its own for
the purpose of governing. Democracy "for the people" goes full circle
down to the begining point and reiterates the point that the government,
i.e. the grant of  authority, will be for the benefit of the people who
constitute it in the first place. Its a form of government best expressed as
Triadic government. Certainly, the usual expressions that it is government
with three Branches that serve as checks and balances is descriptive and
adequate but, leaves itself open to multiple interpretations. For example,
If the Preamble is not considered law or authoritative, what is to be
checked? What is to be balanced? Of course the Preamble does not
contain everything worthwhile in life, nevertheless, it sets up a
government of "We the People..." and a begining value system that
supports the people and the government. The Preamble states the
purpose of the Constitution, the body sets up a Triadic form of
government. We do not need a new Constitution nor to drastically change
the one we have. We just need to examine it with 'geometrical' eyes. We
need to get beneath the words.