Greg Sargent of the Washington Post provided a great behind the scenes look of the current DNC debate debacle. And from the article it's clear the current number and schedule of debates was made to accommodate Team Hillary.
Last spring, when negotiations between the DNC and the Dem campaigns over the debate schedule got underway in earnest, the Clinton camp’s preference was to have only four debates, one in each of the early contest states of Iowa, New Hampshire, Nevada and South Carolina, according to a senior Democrat with knowledge of those conversations.
Asked to comment on this version of events, DNC spokesperson Holly Schulman didn’t immediately dispute it, but declined comment. A Clinton spokesperson didn’t immediately return an email. (This version comports with Politico’s reporting that the Clinton camp prefers to keep the number of debates low.)
The whole story is
here. So it's now very clear the position of the Hillary Clinton on debates and she herself has never explicitly called for more debates only that 'open' to it. More exposure for other candidates would certainly not be good for the Clinton campaign, who hopes to ride on name recognition to victory.