The recent ouster of Fannie Mae’s two top executives amid the turmoil surrounding a potential $9 billion restatement at the company has spurred many observers to put the odds of a new GSE regulatory regime being enacted by Congress in 2005 at about 90 percent. Others, however, are less certain that lawmakers will be able to agree on a GSE reform package anytime soon, given the major party splits on what needs to be done…