to summarize:

you've written a handful of latex documents, so you're now an expert on what latex is used for and what people want out of it. would it help to point out that given latex is more difficult to use than word, I'd bet most latex users have tried and discarded word in favor of latex? Would that affect your judgements about the relative use cases?

   There's people out there that think that the power in typesetting that LaTex 
   has is mutual exclusive with the speed and usability that Word has. That 
   just isn't so.

Since, well, nothing else offers similar typesetting plus mathematical notation / flexibility, your proof is... what exactly?

If you built a better system, you'd find customers for it.