Siemens wanted Branding on a SINGLE Monorail which was not an unreasonable request given the Starbucks,Sunglass Hut and Havianas stores in the parks, Disney said NIX and probably insulted Siemens in the process. But the FLAT NO to the Monorail does speak volumes about Disney's priorities.
1 - It seems that the new Monorail was offered in lieu of cash, Disney needs CASH and the monorail offer was not attractive but WHY Disney needs constant infusions of cash is puzzling, Unless you subscribe to the view that The Mouse's business is actually NOT doing well.
OR
2 - Disney intends on discontinuing the monorail
But no matter what it looks like Disney burned their bridges with Siemens, The 'no conventions to be booked at Disney properties' as reported by
@larryz kind of says the sponsorship talks ended badly.