You don't contest something that is already lost, and even the DNC has never said Bernie Sanders has officially lost and that super delegates do not yet count. That's why the pressure is on by Hillary supporters for Bernie to quit.
This "transitioning phase" is part of a multi-pronged approach to the present Clinton crisis. This is being done to both mislead the public and donors, who just got leaked, as to everything being a-ok happy happy fun time, but also for the highly unlikely event the email scandal disappears, or if Sanders and his global movement drops out of the picture. This won't happen without severe consequence to national stability, in the face of a federal lawsuit for election fraud from the same election fraud specialists that saved Obama from Karl Rove in 2012. (Ohio was rigged, it was discovered and called off. That is why Rove was insisting Romney had already won, and kept insisting, when FOX News called it for Obama. He didn't know the fix was called off.)
Internal polling for Hillary isn't what you see in the media, and anyone with half a brain that covers politics knows what she knows: there is no way she can beat Trump, or any dark horse replacing him, while under an FBI criminal investigation. Another danger she faces is the carefully timed Benghazi report that will probably be released right before the election, if she runs against Trump and she is not indicted yet and the new Wikileaks documents don't destroy the campaign entirely.
What is a possibility, now, is that Hillary is trying to get nominated by any means necessary so that she may appoint her emergency successor after the convention, when she drops out for health reasons or something akin to that. This may be Biden, or Warren. It would need to be someone that can beat Trump and will pardon her if she is indicted and convicted.
Anyone who thinks the Clintons are untouchable needs to remember that President Clinton faced impeachment over something far less serious.
You're kinda walking into this one.
Google's Eric Schmidt has also been on this act by manipulating search results to favor Hillary. Use another search engine instead. Have a look: