Step 1: Paralyze parliament
Step 2: Create an unwritten loophole to the fixed election date law
Not that this is the first time the Tories have speculated about breaking their fixed election date law.
That said, I can't see any logic whatsoever in Harper trying to dissolve parliament himself. Either Dion will bring him down or look kind of foolish not bringing him down - that's what we call a win-win.
So, I'd put this one in "not a chance in hell it will happen" bin.