Thanks to the community for having taken up this challenge!
Many local copies of the template were deleted, but most of them are still there. The progress for wikis that are connected to Wikidata can be monitored via this item.
I also discovered that the parser function is only called if no arguments are present. For example, after two simple edits ([1] and [2]) on the German Wikiversity, the transclusion count dropped from 1608 to 45.

Il 24/12/2014 05:08, Ricordisamoa ha scritto:
Hi guys,
some time ago the '!' parser function was added in MediaWiki to replace the homonym template. However, the latter still exists on lots of WMF wikis.
I've come up with a rough tool to help identifying the wikis on which it's still on use and the ones on which it can be safely deleted. I've already made the server purge the link cache for almost all of them.
But please don't use bots to nominate all those for speedy deletion, only handle wikis you're familiar with ;-)
And don't forget to get the documentation page deleted too!