The wikidata link can help developers get vital information like the current population, current mayor, flags, coat of arms,etc. The list goes on. This is a lot of data that can't necessarily be encoded into OSM. This would help simplify the use of OSM data for small developers. Take for example mapbox's example:
The items in the red square have all been obtained via the wikidata api using the wikidata ID. The flag in the green box, the population in the yellow, the website in the orange box.
There is a plethora of other data available via the wikidata api for example list of movies that happened in that location:
[ "all", ["in", "place", "town", "village", "locality"], ["==", "@type", "node"] ]
And run with the following command:
osm-tag-stats --geojson=towns-output.geojson --mbtiles='canada.mbtiles' --filter='towns.json'
I've started a project on the OSMCanada Tasking Manager here: http://tasks.osmcanada.ca/project/40
Join in for a more data rich Canada :)