Wiki vs E-mail

For some time now at work, I have been trying to fight the following practice:

• The analyst sends a draft version of the functional specification in a Word document via E-mail to programmers, testers, and maintainers.
• each makes its own changes and sends them back.
• The analyst brings together what he considers necessary and the process is repeated until the document is approved.

As an alternative, I offered to work with the wiki.

So far all my attempts came across the following arguments:
- we are so used;
- inconvenient to work with the wiki;
- well, some technical types of notifications, etc. (which are basically solvable and are called more for excuses).

And now I came across an interesting illustration of the interaction on the net.
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www.wikinomics.com/blog/index.php/2008/03/26/wiki-collaboration-leads-to-happiness

Now I will try to more clearly formulate the pros and cons, starting from this scheme.

What do you think about this?