Interesting subject matter, but from the Microformats.org web site itself:

"microformats are not:
* an attempt to get everyone to change their behavior and rewrite their tools
* a whole new approach that throws away what already works today
* a panacea for all taxonomies, ontologies, and other such abstractions"

Using FUD to convince people to take a look at them is probably not the best approach ;) I believe that if something is useful and has real worth, it'll eventually catch on mostly by itself -- my favorite example being RSS. Continue to share examples and give real use-case scenarios and people will pay attention if they see value.