Absolutely. And I wouldn't put it past MS to make it so that either no other browser can be launched within Windows' OS or any that are will be practically unusuable:
Launching another browser + typing the URL + hitting enter = IE automatically popping up with the URL you just typed into Firefox/Opera/whatever denying you the choice (unless you want to close IE everytime you try to surf with something else).
The power that MS has over the average user's computer is phenomenally alarming. I don't expect this to do anything but increase with each release and update of MS-deployed operating systems.
Bill Gates got his start by selling an OS that, either the company he was selling it to bought it for his price, by his terms - or all they had was a piece of metal that would turn on and give you a blank screen. While, now there are other options than Windows for the modern PC - there are none that support the vast array of software (and OS specific hardware) available for the OS.
He then made his fortune off of selling software that he didn't initially exist until he had the money in hand to buy it off of someone else.
These are long-time staples in the Microsoft business model, and proof of that legacy continuing to this day are the dependencies of every Windows user who has invested their time and money on buying into and personalizing settings within windows compatible software as well as the perpetual Windows updates that get dished out by the fistful each month.