Hi.
I think a good way to estimulate scientists, or any other specialist,
to contribute to Wikipedia, at least indirectly, is to produce content
of his/her field with a license compatible with Wikipedia (CC-By,
CC-By-SA, PD...). For example, some scientists are beginning to blog.
Couldn't we use some of their texts for scientific divulgation be used
as a good source of information for improving Wikipedia?
I doubt scientists, in general, will have pacience and/or time to
discuss with some people they can find during editions. Some can also
think easier to write a blog or a web page, than editing a wiki text.
Or can also feel more confortable.
At least in Brazil, if someone in government said scientists should
write on Wikipedia, I believe most would think "What for? What will I
gain from this?", since their recognition comes, usualy, from articles
published and this is what counts when you look for a job. Wikipedia
would make them almost anonymous and maybe with online texts they
would have some feeling of a direct recognition (people comments on
weblog, for example)...
By the way, I thought very nice someone from a government supporting
the use of Wikipedia and spread the news here in Brasil. :-)
[]'s,
Tom