If the Steem blockchain becomes more decentralized, then we could get to a point where Steemit Inc fails and Steem keeps going. At this point, we'd be in rough water if they decided to pack it up and leave. They still hold a majority of the Steem tokens that have been mined/created. They still have been doing a majority of the development. They still pull most of the strings (remember them suggesting that the witnesses approve HF20?).
Maybe Steemit Inc is perfectly within their rights to refuse to give out their financials, but like Smooth said, it's going to be difficult to get organizations and large investors to partner with you if your actions (and inactions) aren't open and honest.
Things can continue as they are, but there's potential for so much more if some positive changes are made. In this case, I think transparency would be one of those positive changes.