I agree it should be fixed in OSM. I recently submitted a patch to JOSM to flag this in the validation.
https://josm.openstreetmap.de/ticket/10693

There are still about 25,000 objects with place_name in them:
https://taginfo.openstreetmap.org/keys/place_name
That's too many for me to fix, and I'm not keen on trying to do a mass tag change. 

Since this tag is widely used for cities, I'd like for mkgmap to read it in. 

On Wed Nov 05 2014 at 9:45:37 PM Nelson A. de Oliveira <naoliv@gmail.com> wrote:
On Thu, Nov 6, 2014 at 12:13 AM, Brian Egge <brianegge@gmail.com> wrote:
>   public static List<String> getNameTags(Properties props) {
> - String nameTagProp = props.getProperty("name-tag-list", "name");
> + String nameTagProp = props.getProperty("name-tag-list",
> "name,place_name");

place_name is a key that should be fixed in OSM itself:
http://wiki.openstreetmap.org/wiki/Proposed_features/drop_recommendation_for_place_name
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