Linux will gradually incorporate more and more binary blobs. The efforts to remove them will become more and more bloated and time-consuming until all the hackers working on it switch to the HURD. It will be finished within a year.
Microsoft will counter this (it's careful progress subverting Linux wasted) with massive counter-strikes. The GPL will be judged non-enforcible in the US and EU, and Stallman will be executed.
This death will send an immediate shockwave through the free software world. Linus Torvalds will side with Microsoft, but many will resist, including the now-enlightened Sun Microsystems. Their systems will be the first to run on GNU/HURD with 100% free software, and other vendors will follow.
However, the death of Stallman awoke a much more powerful force than anything Microsoft has ever faced before... an old friend of Stallman's; a man by the name of GJS Jay Sussman.
The force of the Stallman's wrath devastates the entirety of the north-eastern United States. His body will grow in size and his power will expand to accommodate it, as he strides towards Redmond with the fury of a thousand cdrs in his eyes. The armies of the world, now mere pawns and microserfs, will rise against him, but they will be slain outright by his shining parentheses, and in their homelands, the Haskell Nomads (ancient allies of the Sussman will depose them.
In fourteen days, the Sussman will reach the Citadel of Redmond. Vast legions will rise to meet him, but he will strike them down. On the field, Hal Abelson will ride against him, enslaved by the serpent, but his memories of the Stallman will free his mind, and in his dying throes, he will banish the Serpent from the world forever.
As his parentheses fall around the Citadel, the Sussman's power will grow too great. The forests of the North will be torn free, and in a burst of light, the Sussman will vanish. In his wake will be a devastated land, but one that is now to be rebuilt in the image of the fallen martyr.