When I heard that we could switch out for the X, I called Verizon to do this (after making the mental leap from "I want a DInc!!" to "I want an X!!"). The CSR told me that I could neither switch out nor cancel my DInc order right now. Instead, I'd have to receive my DInc and take it into a VW store to exchange it for a place on the X pre-order list.
Keep in mind that what you are told depends upon who you talk to. In case you haven't noticed from this board, every CSR seems to have a different answer for the same question.
Like you, I'm on the fence and leaning toward the X (and like you said, what's another two weeks at this point?), and I completely understand why bpman moved on.
One option I've seen is not to cancel your DInc but simply to not accept the Fed Ex package when it is delivered, so that it gets shipped back to Verizon. Whether there is a restocking fee for this, I don't know. Frankly, I didn't realize there was a restocking fee for returning the phone within the 30-day window.
Edited to ask: does anyone know what the best method is for switching to the X at this point? I have no clue which way to go if I decide to do this and different stories from various CSRs are not helping my decision-making process.