Personally, I like keeping an open mind and don't necessarily buy into the David and Goliath, open versus walled garden ecosystem narratives which are often the byproduct of new tech startups. I simply buy products based on intrinsic value which is why the EVE V and Surface Pro 5 (given the Surface Pro 4's track record) are on the top of my wishlist.
However, what you say is certainly possible given Microsoft's history, especially when Steve "Man Child" Ballmer (who holds a record for one of the lowest CEO approval ratings in the industry) was bungling the company with this Microsoft 90's mindset. The Surface Pro 3 and its proprietary Surface Connector came out right about the time when Ballmer was walking out the door.
Unlike Ballmer, though, Satya Nadella is quite open to and even bullish about third-party involvement. He is also one of the high brows who was behind the original Windows NT project, who actually knows tech unlike Ballmer. So he is quite intelligent and probably can see past the balminess (pun intended) of locking customers into a walled garden.