To make it easy to move from phpmyvisites to Piwik such a plugin is necessary. It would make its best to convert statistics from phpmyvisites 2.x to piwik, maximizing the user base conversion rate and making the process as smooth as possible.
The plugin is not currently under development - if you would like to help sponsoring this plugin, please contact Piwik Consultants that would be able to help!
Any progress on this?
phpMyVisites isn't being updated. Notably, the potential XSS vulnerability reported in November for phpMyVisites wasn't addressed, but was fixed in Piwik.
I agree that such plugin is needed. In the last phpmyvisites' newsletter, it's suggested to migrate to Piwik, but nothing about what to do with our phpmyvisites' datas..
I don't think this will ever happen, considering the dev time it would require. A more probably import script would be to import from GA, but not yet planned...