The actual "Main Street Bakery" title isn't going anywhere... for those that are assuming that "Starbucks Coffee" will replace MSB in terms of title and signage... you're far off base
Now... for those that are fearing the loss of their beloved cinnamon rolls, ice cream sandwiches, and other MSB specific items... I can understand your concern and hope that Disney continues to offer those items throughout the park. I know it certainly doesn't make it "ok"... but it does appear that Disney is at least "trying" to accommodate i.e. offering the cinnamon rolls and chocolate croissants at Gaston's Tavern as well as the ice cream sandwiches at Sleepy Hollow.
For those arguing the introducing of "outside" brands into the park is un-Walt like, disappointing, and so against Disney traditions...seriously? How often do you see 20oz bottles of Coke, Diet Coke, Dasani, or Sprite lining stroller cup holders, pockets, or if you're like me... displayed from a sweet, shoulder souvenir strap that looked way cooler on display than actually on you? What about Club Cool at Epcot... home to the infamous Beverly taste testing? Frozen Coke anyone?
So can someone tell me what the difference is between a 20oz Coke bottle and a Venti Starbucks cup that at least features the Disney Parks logo? Clearly I'm missing something here. For those that feel that need to argue the "appearance" on Main Street... I again remind you...
NOTHING is changing in regards to exterior name and design. No neon "STARBUCKS COFFEE" heading... though perhaps a slight engraving similar to DCA's... which will most likely go unnoticeable by most guests.
The MSB is closing for a roughly 6mo rehab... whether or not this was to introduce Starbucks branding... one should be more interested in the idea of the space being better suited to handle crowds and lines. If Disney's working to provide me a better product (such as Starbucks coffee over NesCafe) in a more crowd suitable atmosphere... while preserving the nostalgia of the Main Street Bakery... I support that.
Honestly... this just seems so "small" to me. Disney World has far bigger, more impacting plans in their near future. DHS and AK show closings, potential Avatar additions, DHS expansions, etc... and THIS is 25 pages long?
