If it becomes more wide spread, I am confident that most in Michigan will not have liquor licenses due to the insane cost of getting one in Michigan. That most gas stations here don't sell alcohol is rather solid proof of the over bearing state influence in alcohol sales.
I am sure some might get the licenses, but I doubt that many want that kind of atmosphere. I study at Starbucks sometimes, and in a number of them I go to, it is a common thing. You go there to get cranked on coffee, then shove your face into a book or laptop. Others want a quiet place to have casual business meetings, or meet up with friends. I can imagine that it would be appropriate at some locations for people to get **** faced, but most I don't think would want that, because it could easily offend their regulars.
However, I do give them credit, because in the right markets at the right locations, it will probably end up being a very protifable idea.